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7542 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
DESCRIPTION
The 7542 Group is the 8-bit microcomputer based on the 740 fam-
ily core technology.
The 7542 Group has a serial I/O, 8-bit timers, a 16-bit timer, and
an A-D converter, and is useful for control of home electric appli-
ances and office automation equipment.
APPLICATION
Office automation equipment, factory automation equipment,
home electric appliances, consumer electronics, car, etc.
FEATURES
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Basic machine-language instructions ...................................... 71
The minimum instruction execution time ..
0.25
µ
s (Target Spec.)
(at 8 MHz oscillation frequency, double-speed mode for the
shortest instruction)
Memory size ROM ............................................ 8 K to 32 K bytes
RAM ........................................... 384 to 1024 bytes
Programmable I/O ports ....................... 29 (25 in 32-pin version)
Interrupts ................................................. 18 sources, 16 vectors
Timers ............................................................................. 8-bit
✕
2
...................................................................................... 16-bit
✕
2
Output compare ............................................................ 4-channel
Input capture ................................................................ 2-channel
Serial I/O ...................... 8-bit
✕
2 (UART or Clock-synchronized)
A-D converter ............................................... 10-bit
✕
8 channels
.................................................... (6 channels for 32-pin version)
Clock generating circuit ............................................. Built-in type
(low-power dissipation by a ring oscillator)
(connected to external ceramic resonator or quartz-crystal
oscillator permitting RC oscillation)
Watchdog timer ............................................................ 16-bit
✕
1
Power source voltage
X
IN
oscillation frequency at ceramic oscillation, in double-speed mode
At 8 MHz ................................................................................
TBD
X
IN
oscillation frequency at ceramic oscillation, in high-speed mode
At 8 MHz .................................................................... 4.0 to 5.5 V
At 4 MHz .................................................................... 2.4 to 5.5 V
At 2 MHz .................................................................... 2.2 to 5.5 V
X
IN
oscillation frequency at RC oscillation in high-speed mode or
middle-speed mode
At 4 MHz .................................................................... 4.0 to 5.5 V
At 2 MHz .................................................................... 2.4 to 5.5 V
At 1 MHz .................................................................... 2.2 to 5.5 V
Power dissipation ..................................................................
TBD
Operating temperature range ................................... –20 to 85 °C
(–40 to 85 °C for extended operating temperature version)
(–40 to 125 °C for extended operating temperature 125 °C ver-
sion (Note))
Note:
In this version, the operating temperature range and total time are
limited as follows;
55 °C to 85 °C: within total 6000 hours,
85 °C to 125 °C: within total 1000 hours.
Embedded System
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