MC68HC912B32CFU8 Freescale Semiconductor, MC68HC912B32CFU8 Datasheet - Page 131

• Manufacturer Part Number: MC68HC912B32CFU8
• Description: IC MCU 32K FLASH 8MHZ 80-QFP
• Manufacturer: Freescale Semiconductor
• Series: HC12r

Specifications of MC68HC912B32CFU8

• Core Processor: CPU12
• Core Size: 16-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 63
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 768 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

11.2.4 PWM Prescale Counter
Read: Anytime
Write: Only in special mode (SMOD = 1)
PWPRES is a free-running 7-bit counter.
11.2.5 PWM Scale Register 0
Read: Anytime
Write: Anytime
A write causes the scaler counter PWSCNT0 to load the PWSCAL0 value unless it is 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 register
plus one and dividing again by two. When PWSCAL0 = $FF, clock A is divided by 256 then divided by two
to generate clock S0.
11.2.6 PWM Scale Counter 0 Value
Read: Anytime
PWSCNT0 is a down-counter that, upon reaching $00, loads the value of PWSCAL0.
Freescale Semiconductor
Address: $0043
Address: $0044
Address: $0045
Reset:
Reset:
Reset:
Read:
Read:
Read:
Write:
Write:
Write:
Figure 11-9. PWM Scale Counter Register 0 (PWSCNT0)
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
0
0
0
0
Figure 11-8. PWM Scale Register 0 (PWSCAL0)
Figure 11-7. PWM Prescale Counter (PWPRES)
= Unimplemented
= Unimplemented
Bit 6
Bit 6
Bit 6
6
0
6
0
6
0
M68HC12B Family Data Sheet, Rev. 9.1
Bit 5
Bit 5
Bit 5
5
0
5
0
5
0
Bit 4
Bit 4
Bit 4
4
0
4
0
4
0
Bit 3
Bit 3
Bit 3
3
0
3
0
3
0
Bit 2
Bit 2
Bit 2
2
0
2
0
2
0
Bit 1
Bit 1
Bit 1
1
0
1
0
1
0
PWM Register Descriptions
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
0
0
0
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