Ordering number : ENN7854
LC87F71C8A
Overview
CMOS IC
FROM 128K-byte, RAM 4096-byte on chip
8-bit 1-chip Microcontroller
The LC87F71C8A is an 8-bit single chip microcontroller with the following on-chip functional blocks :
•
CPU : operable at a minimum bus cycle time of 100ns
•
128K-bytes flash ROM (on-board rewritable)
•
On-chip RAM : 4096-bytes
•
LCD controller/driver
•
16-bit timer/counters (can be divided into 8-bit units)
•
16-bit timer (can be divided into 8-bit timers, 8-bit timer can be PWM)
•
Four 8-bit timer with prescalers
•
Timer for use as date/time clock
•
Synchronous serial I/O port (with automatic block transmit/receive function)
•
Asynchronous/synchronous serial I/O port
•
Two sets of 12-bit PWM
•
12-channel × 8-bit AD converter
•
High-speed clock counter
•
System clock divider
•
Small signal detector
•
19-source 10-vectored interrupt system
All of the above functions are fabricated on a single chip.
Features
■Flash
ROM
•
Single 5V power supply, on-board writable
•
Block erase in 128-byte units
•
131072 × 8-bits (LC87F71C8A)
■Random
access memory (RAM)
•
4096 × 9-bits (LC87F71C8A)
■Minimum
bus cycle time
•
100ns (10MHz)
Note : The bus cycle time indicates ROM read time.
Ver.1.04
D2702
82504 JO IM No.7854-1/20
LC87F71C8A
■Minimum
instruction cycle time
•
300ns (10MHz)
■Ports
•
Input/output ports
Data direction programmable for each bit individually : 20 (P1n, P70 to P73, P8n)
Data direction programmable in nibble units
: 8 (P0n)
(When N-channel open drain output is selected, data can be input in bit units.)
•
Input ports
: 2 (XT1, XT2)
•
Output ports
: 2 (PWM2, PWM3)
•
LCD ports
Segment output
: 32 (S00 to S15, S24 to S39)
Common output
: 4 (COM0 to COM3)
Bias terminals for LCD driver
3 (V1 to V3)
Other functions
Input/output ports
: 32 (PAn, PBn, PDn, PEn)
Input ports
: 7 (PLn)
•
Oscillator pins
: 2 (CF1, CF2)
•
Reset pin
: 1 (RES)
•
Power supply
: 6 (VSS1 to 3, VDD1 to 3)
■LCD
controller
•
Seven display modes are available (static, 1/2, 1/3, 1/4 duty × 1/2, 1/3 bias)
•
Segment output and common output can be switched to general purpose input/output ports.
■Small
signal detection (MIC signals etc)
•
Counts pulses with the level which is greater than a preset value
•
2-bit counter
■Timer
•
Timer 0 : 16-bit timer/counter with capture register
Mode 0 : 2-channel 8-bit timer with programmable 8-bit prescaler and 8-bit capture register
Mode 1 : 8-bit timer with 8-bit programmable prescaler and 8-bit capture register + 8-bit
Counter with 8-bit capture register
Mode 2 : 16-bit timer with 8-bit programmable prescaler and 16-bit capture register
Mode 3 : 16-bit counter with 16-bit capture register
•
Timer 1 : PWM/16-bit timer with toggle output function
Mode 0 : 2-channel 8-bit timer with 8-bit prescaler (with toggle output)
Mode 1 : 2-channel 8-bit PWM with 8-bit prescaler
Mode 2 : 16-bit timer with 8-bit prescaler (with toggle output) Toggle output from lower 8-bits is also possible.
Mode 3 : 16-bit timer with 8-bit prescaler (with toggle output) Lower order 8-bits can be used as PWM.
•
Timer 4 : 8-bit timer with 6-bit prescaler
•
Timer 5 : 8-bit timer with 6-bit prescaler
•
Timer 6 : 8-bit timer with 6-bit prescaler (with toggle output)
•
Timer 7 : 8-bit timer with 6-bit prescaler (with toggle output)
•
Base Timer
1. The clock signal can be selected from any of the following :
Sub-clock (32.768kHz crystal oscillator), system clock, and prescaler output from timer 0
2. Interrupts of five different time intervals are possible.
■High
speed clock counter
•
Countable up to 20MHz clock (when using 10MHz main clock)
•
Real time output
No.7854-2/20
LC87F71C8A
■Serial
interface
•
SIO0 : 8-bit synchronous serial interface
1. LSB first/MSB first is selectable
2. Internal 8-bit baud-rate generator (fastest clock period 4/3 tCYC)
3. Consecutive automatic data communication (1 to 256-bits)
•
SIO1 : 8-bit asynchronous/synchronous serial interface
Mode 0 : Synchronous 8-bit serial IO (2-wire or 3-wire, transmit clock 2 to 512 tCYC)
Mode 1 : Asynchronous serial IO (half duplex, 8 data bits, 1 stop bit, baud-rate 8 to 2048 tCYC)
Mode 2 : Bus mode 1 (start bit, 8 data bits, transmit clock 2 to 512 tCYC)
Mode 3 : Bus mode 2 (start detection, 8 data bits, stop detection)
■AD
converter
•
8-bits × 12-channels
■PWM
•
Two sets of 12-bit Periodic variable PWM
■Remote
control receiver circuit (connected to P73/INT3/T0IN terminal)
•
Noise rejection function (noise rejection filter’s time constant can be selected from 1/32/128 tCYC)
■Watchdog
timer
•
The watching time period is determined by an external RC.
•
Watchdog timer can produce interrupt or system reset
■Interrupts
: 19 sources, 10 vectors
1. Three priority (low, high and highest) multiple interrupts are supported.
During interrupt handling, an equal or lower priority interrupt request is postponed.
2. If interrupt requests to two or more vector addresses occur at once, the higher priority interrupt takes
precedence. In the case of equal priority levels, the vector with the lowest address takes precedence.
No.
1
2
3
4
5
6
7
8
9
10
Vector
00003H
0000BH
00013H
0001BH
00023H
0002BH
00033H
0003BH
00043H
0004BH
Selectable Level
X or L
X or L
H or L
H or L
H or L
H or L
H or L
H or L
H or L
H or L
INT0
INT1
INT2/T0L
INT3/Base timer
T0H
T1L/T1H
SIO0
SIO1
ADC/MIC/T6/T7
Port 0/T4/T5/PWM2, 3
Interrupt Signal
• Priority Level : X>H>L
• For equal priority levels, vector with lowest address takes precedence.
■Subroutine
stack levels : 2048 levels max. Stack is located in RAM.
■Multiplication
and division
•
16-bit × 8-bit
(executed in 5 cycles)
•
24-bit × 16-bit
(12 cycles)
•
16-bit ÷ 8-bit
(8 cycles)
•
24-bit ÷ 16-bit
(12 cycles)
No.7854-3/20
LC87F71C8A
■Oscillation
circuits
•
On-chip RC oscillation for system clock use.
•
CF oscillation for system clock use. (Rf built in, Rd external)
•
Crystal oscillation low speed system clock use. (Rf built in, Rd external)
•
On-chip frequency variable RC oscillation circuit for system clock use.
■System
clock divider
•
Low power consumption operation is available
•
Minimum instruction cycle time (300ns, 600ns, 1.2µs, 2.4µs, 4.8µs, 9.6µs, 19.2µs, 38.4µs, 76.8µs can be
switched by program (when using 10MHz main clock)
■Standby
function
•
HALT mode
HALT mode is used to reduce power consumption. During the HALT mode, program execution is stopped but
peripheral circuits keep operating (some parts of serial transfer operation stop.)
1. Oscillation circuits are not stopped automatically.
2. Released by the system reset or interrupts.
•
HOLD mode
HOLD mode is used to reduce power consumption. Program execution and peripheral circuits are stopped.
1. CF, RC and crystal oscillation circuits stop automatically.
2. Released by any of the following conditions.
1. Low level input to the reset pin
2. Specified level input to one of INT0, INT1, INT2
3. Port 0 interrupt
•
X’tal HOLD mode
X’tal HOLD mode is used to reduce power consumption. Program execution is stopped.
All peripheral circuits except the base timer are stopped.
1. CF and RC oscillation circuits stop automatically.
2. Crystal oscillator operation is kept in its state at HOLD mode inception.
3. Released by any of the following conditions
1. Low level input to the reset pin
2. Specified level input to one of INT0, INT1, INT2
3. Port 0 interrupt
4. Base-timer interrupt
■Package
•
QFP80
•
TQFP80
■Development
tools
•
Evaluation chip
•
Emulator
: LC876091
: EVA62S + ECB876600C (Evaluation chip board) + SUB877100 +
POD80QFP (14×14) or POD80SQFP
: ICE-B877300 + SUB877100 + POD80QFP (14×14) or POD80SQFP
•
Flash ROM write adapter : W87F71256QF or W87F71256SQ
■Same
package and pin assignment as mask ROM version.
1. LC877100 series options can be set using flash ROM data.
Thus the board used for mass production can be used for debugging and evaluation without modifications.
2. If the program for the mask ROM version is used, the usable ROM/RAM capacity is the same as the mask ROM
version.
No.7854-4/20
LC87F71C8A
Package Dimensions
unit : mm
3255
Package Dimensions
unit : mm
3298
Pin Assignment
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
V1/PL4
V2/PL5
V3/PL6
S39/PE7
S38/PE6
S37/PE5
S36/PE4
S35/PE3
S34/PE2
S33/PE1
S32/PE0
S31/PD7
S30/PD6
S29/PD5
S28/PD4
S27/PD3
S26/PD2
S25/PD1
S24/PD0
S15/PB7
P14/SI1/SB1
P15/SCK1
P16/T1PWML
P17/T1PWMH/BUZ
RES
XT1/AN10
XT2/AN11
VSS1
CF1
CF2
VDD1
P80/AN0
P81/AN1
P82/AN2
P83/AN3
P84/AN4
P85/AN5
P86/AN6
P87/AN7/MICIN
P70/INT0/T0LCP/AN8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
COM0/PL0
COM1/PL1
COM2/PL2
COM3/PL3
PWM2
VSS3
VDD3
PWM3
P00
P01
P02
P03
P04
P05
P06
P07
P10/SO0
P11/SI0/SB0
P12/SCK0
P13/SO1
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
LC87F71C8A
VSS2
VDD2
S14/PB6
S13/PB5
S12/PB4
S11/PB3
S10/PB2
S9/PB1
S8/PB0
S7/PA7
S6/PA6
S5/PA5
S4/PA4
S3/PA3
S2/PA2
S1/PA1
S0/PA0
P73/INT3/T0IN
P72/INT2/T0IN
P71/INT1/T0HCP/AN9
Top view
No.7854-5/20
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