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參數資料
| 型號： | MC68B912B32 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 2.5V 100ppm/Degrees C, 50uA in SOT23-3 Series (Bandgap) Voltage Reference 3-SOT-23 -40 to 125 |
| 中文描述： | 16位微控制器 |
| 文件頁數： | 68/128頁 |
| 文件大小： | 748K |
| 代理商： | MC68B912B32 |
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MOTOROLA
68
MC68HC912B32
MC68HC912B32TS/D
PWPRES is a free-running 7-bit counter. Read anytime. Write only in special mode (SMOD = 1).
Read and write anytime. A write will cause the scaler counter PWSCNT0 to load the PWSCAL0 value
unless in special mode with DISCAL = 1 in the PWTST register.
PWM channels 0 and 1 can select clock S0 (scaled) as its input clock by setting the control bit PCLK0
and PCLK1 respectively. Clock S0 is generated by dividing clock A by the value in the PWSCAL0 reg-
ister and dividing again by two. When PWSCAL0 = $00, clock A is divided by 256 then divided by two
to generate clock S0.
PWSCNT0 is a down-counter that, upon reaching $00, loads the value of PWSCAL0. Read any time.
Read and write anytime. A write will cause the scaler counter PWSCNT1 to load the PWSCAL1 value
unless in special mode with DISCAL = 1 in the PWTST register.
PWM channels 2 and 3 can select clock S1 (scaled) as its input clock by setting the control bit PCLK2
and PCLK3 respectively. Clock S1 is generated by dividing clock B by the value in the PWSCAL1 reg-
ister and dividing again by two. When PWSCAL1 = $00, clock B is divided by 256 then divided by two
to generate clock S1.
PWSCNT1 is a down-counter that, upon reaching $00, loads the value of PWSCAL1. Read any time.
PWPRES —
PWM Prescale Counter
$0043
Bit 7
6
5
4
3
2
1
Bit 0
0
Bit 6
5
4
3
2
1
Bit 0
RESET:
0
0
0
0
0
0
0
0
PWSCAL0 —
PWM Scale Register 0
$0044
Bit 7
6
5
4
3
2
1
Bit 0
Bit 7
6
5
4
3
2
1
Bit 0
RESET:
0
0
0
0
0
0
0
0
PWSCNT0 —
PWM Scale Counter 0 Value
$0045
Bit 7
6
5
4
3
2
1
Bit 0
Bit 7
6
5
4
3
2
1
Bit 0
RESET:
0
0
0
0
0
0
0
0
PWSCAL1 —
PWM Scale Register 1
$0046
Bit 7
6
5
4
3
2
1
Bit 0
Bit 7
6
5
4
3
2
1
Bit 0
RESET:
0
0
0
0
0
0
0
0
PWSCNT1 —
PWM Scale Counter 1 Value
$0047
Bit 7
6
5
4
3
2
1
Bit 0
Bit 7
6
5
4
3
2
1
Bit 0
RESET:
0
0
0
0
0
0
0
0
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