mc68hc908mr32 Freescale Semiconductor, Inc, mc68hc908mr32 Datasheet - Page 143
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mc68hc908mr32
Manufacturer Part Number
mc68hc908mr32
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908MR32.pdf
(282 pages)
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12.8 PWM Operation in Wait Mode
When the microcontroller is put in low-power wait mode via the WAIT instruction, all clocks to the PWM
module will continue to run. If an interrupt is issued from the PWM module (via a reload or a fault), the
microcontroller will exit wait mode.
Clearing the PWMEN bit before entering wait mode will reduce power consumption in wait mode because
the counter, prescaler divider, and LDFQ divider will no longer be clocked. In addition, power will be
reduced because the PWMs will no longer toggle.
12.9 Control Logic Block
This subsection provides a description of the control logic block.
12.9.1 PWM Counter Registers
The PWM counter registers (PCNTH and PCNTL) display the 12-bit up/down or up-only counter. When
the high byte of the counter is read, the lower byte is latched. PCNTL will hold this latched value until it is
read. See
Freescale Semiconductor
Figure 12-33
Address:
Address:
Reset:
Reset:
Read:
Read:
Write:
Write:
$0026
$0027
Bit 7
Bit 7
Bit 7
Figure 12-33. PWM Counter Register High (PCNTH)
0
0
0
and
Figure 12-34. PWM Counter Register Low (PCNTL)
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
Figure
= Unimplemented
= Unimplemented
Bit 6
6
0
0
6
0
12-34.
Bit 5
5
0
0
5
0
Bit 4
4
0
0
4
0
Bit 11
Bit 3
3
0
3
0
Bit 10
Bit 2
2
0
2
0
Bit 9
Bit 1
1
0
1
0
PWM Operation in Wait Mode
Bit 0
Bit 8
Bit 0
Bit 0
0
0
143
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