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| 型號(hào)： | MC68HC912BL16VFU8 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | QFP-64 |
| 文件頁(yè)數(shù)： | 88/128頁(yè) |
| 文件大?。?/td> | 532K |
| 代理商： | MC68HC912BL16VFU8 |
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MOTOROLA
MC68HC912BL16
62
MC68HC912BL16TS/D
Always reads $00.
Writing $55 to this address is the first step of the COP watchdog sequence.
Writing $AA to this address is the second step of the COP watchdog sequence. Other instructions may
be executed between these writes but both must be completed in the correct order prior to time-out to
avoid a watchdog reset. Writing anything other than $55 or $AA causes a COP reset to occur.
Read and write anytime.
The slow clock divider is included to deliver a variable clock frequency to the MCU in wait mode. This
slow clock is drived from the EXTALi and in wait mode can be used for the system clocks.
Write to this register changes the SLWCLK frequency. The frequency divide ratio is 2 times SLOW reg-
ister value, hence the divide range is 2 to 30, by steps of 2. When SLOW register = 0, the divider is
bypassed. The generation of E and P clocks further divides SLWCLK by 2. Hence, the final ratio of Bus
to EXTAL Frequency is programmable to 2, 4, 8, 12, 16, ..., 60, by steps of 4.
Table 21 COP Watchdog Rates (RTBYP = 0)
CR2
CR1
CR0
Divide E By:
At E = 4.0 MHz
Time-Out
–0 to +2.048 ms
At E = 8.0 MHz
Time-Out
–0 to +1.024 ms
0
OFF
0
1
213
2.048 ms
1.024 ms
0
1
0
215
8.1920 ms
4.096 ms
0
1
217
32.768 ms
16.384 ms
1
0
219
131.072 ms
65.536 ms
1
0
1
221
524.288 ms
262.144 ms
1
0
222
1.048 s
524.288 ms
1
223
2.097 s
1.048576 s
COPRST — Arm/Reset COP Timer Register
$0017
Bit 7
6
5
4
3
2
1
Bit 0
Bit 7
6
5
4
3
2
1
Bit 0
RESET:
0
SLOW — Slow mode Divider Register
$00E0
Bit 7
6
5
4
3
2
1
Bit 0
0
SLDV3
SLDV2
SLDV1
SLDV0
RESET:
0
Table 22 SLOW Mode Register Divider Rates
SLDV3 SLDV2 SLDV1 SLDV0
Divide By:
(SLOW * 2)
Bus Rate w/
16MHz XTAL
Bus Rate w/
8MHz XTAL
Bus Rate w/
4MHz XTAL
0
8 MHz
4 MHz
2 MHz
0
1
2
4 MHz
2 MHz
1 MHz
0
1
0
4
2 MHz
1 MHz
500 KHz
0
1
6
1.3 MHz
667 KHz
333 KHz
0
1
0
8
1 MHz
500 KHz
250 KHz
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