3
Item
Description
Memory
Large on-chip memory
H8/3935, H8/3935R: 40-kbyte ROM, 2-kbyte RAM
H8/3936, H8/3936R: 48-kbyte ROM, 2-kbyte RAM
H8/3937, H8/3937R: 60-kbyte ROM, 2-kbyte RAM
I/O ports
67 pins
59 I/O pins
8 input pins
5 internal I/O
1 internal input
Timers
Five on-chip timers
Timer A: 8-bit timer
Count-up timer with selection of eight internal clock signals divided from the
system clock ()
*
and four clock signals divided from the watch clock (w)
*
Timer C: 8-bit timer
Count-up/down timer with selection of seven internal clock signals or event
input from external pin
Auto-reloading
Timer F: 16-bit timer
Can be used as two independent 8-bit timers
Count-up timer with selection of four internal clock signals or event input
from external pin
Provision for toggle output by means of compare-match function
Timer G: 8-bit timer
Count-up timer with selection of four internal clock signals
Incorporates input capture function (built-in noise canceler)
Watchdog timer
Reset signal generated by overflow of 8-bit counter
Two serial communication interface channels on chip
Internal serial communication interface function
Serial
communication
interface
SCI1: Synchronous serial interface
8-bit or 16-bit transfer data can be selected
Used for interface to on-chip FLEX decoder
SCI31: 8-bit synchronous/asynchronous serial interface
Incorporates multiprocessor communication function
SCI32: 8-bit synchronous/asynchronous serial interface
Incorporates multiprocessor communication function