Table of Contents
Advertisement
Item
Memory
I/O ports
Timers
Description
H8/3857 Group
•
H8/3855: 40-kbyte ROM, 2-kbyte RAM
•
H8/3856: 48-kbyte ROM, 2-kbyte RAM
•
H8/3857: 60-kbyte ROM, 2-kbyte RAM
•
H8/3857F: 60-kbyte ROM, 2-kbyte RAM
H8/3854 Group
•
H8/3852: 16-kbyte ROM, 1-kbyte RAM
•
H8/3853: 24-kbyte ROM, 1-kbyte RAM
•
H8/3854: 32-kbyte ROM, 1-kbyte RAM
•
H8/3854F: 60-kbyte ROM, 2-kbyte RAM
Note that the H8/3854 (mask ROM version) and H8/3854F (F-ZTAT
version) have different ROM and RAM sizes.
H8/3857 Group: 44 I/O port pins
•
I/O pins: 35
•
Input pins: 9
H8/3854 Group: 29 I/O port pins
•
I/O pins: 24
•
Input pins: 5
Four on-chip timers (three in the H8/3854 Group)
•
Timer A: 8-bit timer
Count-up timer with selection of eight internal clock signals divided
from the system clock (φ)*
1
watch clock (φ
)*
w
•
Timer B: 8-bit timer
⎯ Count-up timer with selection of seven internal clock signals or
event input from external pin
⎯ Auto-reloading
•
Timer C: 8-bit timer (in H8/3857 Group only)
⎯ Count-up/count-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
⎯ Compare-match function with toggle output
1
and four clock signals divided from the
Rev.3.00 Jul. 19, 2007 page 3 of 532
1. Overview
REJ09B0397-0300
Advertisement
Table of Contents
