Philips Semiconductors
Product specification
8-bit microcontroller
1
FEATURES
2
GENERAL DESCRIPTION
PCF84C12A
•
Manufactured in silicon gate CMOS process
•
8-bit CPU, ROM, RAM, I/O in a 20-lead package
•
1 kbyte ROM
•
64 byte RAM
•
Over 100 instructions (based on MAB8048) all of
1 or 2 cycles
•
13 quasi-bidirectional I/O port lines
•
8-bit programmable timer/event counter 1
•
Two single-level vectored interrupts:
– external
– 8-bit programmable timer/event counter 1
•
Two test inputs, one of which also serves as the external
interrupt input
•
Stop and Idle modes
•
Supply voltage: 2.5 to 5.5 V
•
Clock frequency: 1 to 16 MHz
•
Operating temperature:
−40
to +85
°C.
3
ORDERING INFORMATION
TYPE NUMBER
(1)
NAME
PCF84C12AP
PCF84C12AT
Note
DIP20
SO20
This data sheet details the specific properties of the
PCF84C12A. The shared properties of the PCF84CxxxA
family of microcontrollers are described in the
“PCF84CxxxA family”
data sheet, which should be read in
conjunction with this publication. Note that the devices
described in this data sheet do not feature I
2
C-bus
compatibility or derivative logic, so the information given in
the family data sheet about these features can be ignored.
The PCF84C12A is a general purpose CMOS
microcontroller with 1 kbyte of program memory.
It includes 64 bytes of RAM and 13 I/O port lines.
The instruction set is based on the MAB8048 and is a
sub-set of that listed in the
“PCF84CxxxA family”
data
sheet.
PACKAGE
DESCRIPTION
plastic dual in-line package; 20 leads (300 mil)
plastic small outline package; 20 leads; body width 7.5 mm
VERSION
SOT146-1
SOT163-1
1. Please refer to the Order Entry Form (OEF) for these devices for the full type number to use when ordering. This type
number will also specify the required program and ROM mask options.
1998 May 11
3
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4
P1.0 to P1.4
P0.7 to P0.0
3
PORT 1
BUFFER
PORT 0
BUFFER
PORT 0
FLIP-FLOPS
PORT 1
FLIP-FLOPS
RESIDENT ROM
1 kbyte
(PCF84C12A)
2 kbytes
(PCF84C22A)
4 kbytes
(PCF84C42A)
DECODE
handbook, full pagewidth
1998 May 11
Philips Semiconductors
8-bit microcontroller
BLOCK DIAGRAM
INTERNAL
CLOCK
FREQ.
30
HIGHER
PROGRAM
COUNTER
LOWER
PROGRAM
COUNTER
PROGRAM
STATUS
WORD
MEMORY
BANK
FLIP-FLOPS
32
TEST 1
TIMER/
EVENT
COUNTER
5
5
8
8
8
8
8
8
8
8
8
8
MULTIPLEXER
4
TEMPORARY
REGISTER 1
TEMPORARY
REGISTER 2
RAM
ADDRESS
REGISTER
ARITHMETIC
LOGIC UNIT
INSTRUCTION
REGISTER
&
DECODER
REGISTER 0
REGISTER 1
REGISTER 2
REGISTER 3
REGISTER 4
REGISTER 5
REGISTER 6
REGISTER 7
INT / T0
(8)
TEST 1
TIMER
FLAG
CONDITIONAL
BRANCH
LOGIC
CARRY
ACC
XTAL 2
ACC BIT
TEST
RESIDENT RAM ARRAY
64 bytes
MBC951
INTERRUPT
LOGIC
ACCUMULATOR
timer interrupt
D
E
C
O
D
E
8 LEVEL STACK
(VARIABLE LENGTH)
OPTIONAL SECOND
REGISTER BANK
external interrupt
DECIMAL
ADJUST
DATA STORE
STOP
CONTROL & TIMING
INT / T0
INITIALIZE
OSCILLATOR
RESET
XTAL 1
IDLE
INTERRUPT
PCF84C12A
Product specification
Fig.1 Block diagram of PCF84C12A.
Philips Semiconductors
Product specification
8-bit microcontroller
5
5.1
PINNING INFORMATION
Pinning
5.2
Pin description
PCF84C12A
Table 1
DIP20 and SO20 packages
PIN
1 to 8
TYPE
I/O
DESCRIPTION
Port 0: 8-bit
quasi-bidirectional
I/O port
Interrupt/Test 0
ground
Test 1/count input of
8-bit timer/event
counter 1
crystal oscillator
input or external
clock input
crystal oscillator
output
reset input
Port 1: 4-bit
quasi-bidirectional
I/O port
positive supply
SYMBOL
handbook, halfpage
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
INT/T0
1
2
3
4
5
20 V DD
19
18
17
16
P1.4
P1.3
P1.2
P1.1
P1.0
RESET
XTAL2
XTAL1
T1
P0.0 to P0.7
INT/T0
V
SS
T1
9
10
11
I
P
I
PCF84C12A
6
7
8
9
15
14
13
12
11
MBK778
XTAL1
12
I
XTAL2
RESET
P1.0 to P1.4
13
14
15 to 19
O
I
I/O
VSS 10
Fig.2 Pin configuration.
V
DD
6
INSTRUCTION SET
20
P
Since the I
2
C-bus interface, Port 2 and derivative logic are
not provided, instructions associated with these functions
are not available.
ROM space is restricted to 1 kbyte for the PCF84C12A.
Therefore, the instructions SEL MB1/2/3 should be
avoided as they would define non-existing program
memory banks.
As RAM space is limited to 64 bytes, care should be taken
to avoid accesses to non-existing RAM locations.
Refer to the
“PCF84CxxxA family”
data sheet, for a
complete description of the instruction set.
1998 May 11
5
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