MC68HC908MR8 Datasheet, PDF (172/372 Pages) Motorola, Inc – Microcontrollers

Pulse-Width Modulator for Motor Control
9.12 Control Logic Block
This subsection provides a description of the control logic block.
9.12.1 PWM Counter Registers
The PWM counter registers (PCNTH and PCNTL) display the12-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.
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Bit 7
6
5
4
3
2
1
Bit 0
Read: 0
0
0
0
Bit11 Bit 10 Bit 9 Bit 8
Write:
Reset: 0
0
0
0
0
0
0
0
= Unimplemented
Figure 9-29. PWM Counter Register High (PCNTH)
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Bit 7
6
5
4
3
2
1
Bit 0
Read: Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Write:
Reset: 0
0
0
0
0
0
0
0
= Unimplemented
Figure 9-30. PWM Counter Register Low (PCNTH)
Technical Data
172
MC68HC908MR8 — Rev 4.1
Pulse-Width Modulator for Motor Control (PWMMC) Freescale Semiconductor