MC81F4332 Datasheet, PDF (107/198 Pages) Finechips – ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS

MC81F4432
15.1 Registers
CKCTLR
CLOCK CONTROL REGISTER
00F2H
7
6
5
4
3
2
1
0
CKCTLR
–
–
– WDTON BTCL
BTS
Reset value: 17H
–
–
– R/W R/W R/W R/W R/W
–
WDTON
bit7 – bit5
Watchdog Timer Enable Bit
BTCL Basic Timer Clear Bit
BTS
Basic Interval Timer Source Clock
Selection Bits
Not used for MC81F4x32
0: Operate as 7-bit timer
1: Enable Watchdog timer
0: Normal operation (free-run)
1: Clear 8-bit counter (BITR) to “0”,
This bit becomes 0 automatically after one
machine cycle, and starts counting.
000: fxin/8
001: fxin/16
010: fxin/32
011: fxin/64
100: fxin/128
101: fxin/256
110: fxin/512
111: fxin/1024
CKCTLR[2:0]
000
001
010
011
100
101
110
111
Source clock
fxin/8
fxin/16
fxin/32
fxin/64
fxin/128
fxin/256
fxin/512
fxin/1024
Interrupt(overflow) period (ms)
@ fxin = 8MHz
0.256
0.512
1.024
2.048
4.096
8.192
16.384
32.768
Figure 15-1 Basic Interval Timer Interrupt Period
BTCR
BASIC TIMER COUNTER REGISTER
00F1H
7
6
5
4
3
2
1
0
BTCR
One byte register
Reset value: XXH
R
R
R
R
R
R
R
R
A 8 bit count register for the basic interval timer.
October 19, 2009 Ver.1.35
107