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MC81F4204M Datasheet(PDF) 89 Page - Finechips

Part No. MC81F4204M
Description  ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS
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Manufacturer  FINECHIPS [Finechips]
Direct Link  http://www.finechips.com
Logo FINECHIPS - Finechips

MC81F4204M Datasheet(HTML) 89 Page - Finechips

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MC81F4204
October 19, 2009 Ver.1.35
89
14.1 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
bit7
– bit5
Not used for MC81F4204
WDTON
Watchdog Timer Enable Bit
0: Operate as 7-bit timer
1: Enable Watchdog timer
BTCL
Basic Timer Clear Bit
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.
BTS
Basic Interval Timer Source Clock
Selection Bits
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]
Source clock
Interrupt(overflow) period (ms)
@ fxin = 8MHz
000
fxin/8
0.256
001
fxin/16
0.512
010
fxin/32
1.024
011
fxin/64
2.048
100
fxin/128
4.096
101
fxin/256
8.192
110
fxin/512
16.384
111
fxin/1024
32.768
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.
Figure 14-1 Basic Interval Timer Interrupt Period


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