General registers: Sixteen 8-bit registers (can be used as eight 16-bit
registers)
Operating speed
Max. operating speed: 5 MHz
Add/subtract: 0.4 µs (operating at 5 MHz)
Multiply/divide: 2.8 µs (operating at 5 MHz)
Can run on 32.768 kHz subclock
Instruction set compatible with H8/300 CPU
Instruction length of 2 bytes or 4 bytes
Basic arithmetic operations between registers
MOV instruction for data transfer between memory and registers
Typical instructions
Multiply (8 bits × 8 bits)
Divide (16 bits ÷ 8 bits)
Bit accumulator
Register-indirect designation of bit position
Interrupts:
33 interrupt sources
12 external interrupt sources (IRQ3 to IRQ0, INT7
to INT0)
21 internal interrupt sources
Clock pulse generators:
Two on-chip clock pulse generators
System clock pulse generator: 1 to 10 MHz
Subclock pulse generator: 32.768 kHz
Power-down modes:
Seven power-down modes
Sleep (high-speed) mode
Sleep (medium-speed) mode
Standby mode
Watch mode
Subsleep mode
Subactive mode
Active (medium-speed) mode
Memory:
Large on-chip memory
H8/3657: 60-kbyte ROM, 2-kbyte RAM
H8/3656: 48-kbyte ROM, 2-kbyte RAM
H8/3655: 40-kbyte ROM, 2-kbyte RAM
H8/3654: 32-kbyte ROM, 1 kbyte RAM
H8/3653: 24-kbyte ROM, 1 kbyte RAM
H8/3652: 16-kbyte ROM, 1 kbyte RAM
I/O ports:
67 pins
59 I/O pins
8 input pins
Timers:
Five on-chip timers
Timer A: 8-bit time
Count-up timer with selection of eight internal clock signals divided from the
system clock (ø)* and four clock signals divided from the watch clock (ø
w)*
Timer B1: 8-bit timer
Count-up timer with selection of seven internal clock signals or event input
from external pin
Auto-reloading
Timer V: 8-bit timer
Count-up timer with selection of six internal clock signals or event input
from external pin
Compare-match waveform output
Incrementing specifiable by external trigger input
Timer X: 16-bit timer
Count-up timer with selection of three internal clock signals or event input
from external pin
Output compare (2 output pins)
Input capture (4 input pins)
Watchdog timer
Reset signal generated by 8-bit counter overflow
Serial communication interface:
Two channels on chip
SCI1: synchronous serial interface
Choice of 8-bit or 16-bit data transfer
SCI3: 8-bit synchronous/asynchronous serial interface
Incorporates multiprocessor communication function
14-bit PWM:
Pulse-division PWM output for reduced ripple
Can be used as a 14-bit D/A converter by connecting to an external low-pass
filter.
A/D converter:
Successive approximations using a resistance ladder
8-channel analog input pins
Conversion time: 31/ø or 62/ø per channel
Note:
*
ø and øware defined in section 4, Clock Pulse Generators.
Japan English
