Hitachi H8/3937 Series Hardware Manual page 15

Item Description
Memory Large on-chip memory
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I/O ports 67 pins
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Timers Five on-chip timers
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Serial Two serial communication interface channels on chip
communication
Internal serial communication interface function
interface
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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
59 I/O pins
8 input pins
5 internal I/O
1 internal input
Timer A: 8-bit timer
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 (øw)*
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
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
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