MC68HC908MR8 Datasheet, PDF (179/372 Pages) Motorola, Inc – Microcontrollers

Pulse-Width Modulator for Motor Control (PWMMC)
Control Logic Block
NOTE:
If PRSC1 and PRSC2 are set to any value other than 0, there is a one
PWM cycle latency time before the PWM pins are driven after the
PWMEN bit is set.
9.12.6 Dead-Time Write-Once Register
The dead-time write-once register (DEADTM) holds an 8-bit value which
specifies the number of CPU clock cycles to use for the dead-time when
complementary PWM mode is selected. After this register is written for
the first time, it cannot be rewritten unless a RESET occurs. The
dead-time is not affected by changes to the prescaler value.
Ad-
dress:
$0036
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 7
Write:
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset: 1
1
1
1
1
1
1
1
Figure 9-37. Dead-Time Write-Once Register (DEADTM)
9.12.7 PWM Disable Mapping Write-Once Register
The PWM disable mapping write-once register (DISMAP) holds an 8-bit
value which determines which PWM pins will be disabled if an external
fault or software disable occur. For a further description of the disable
mapping, see 9.7 Fault Protection. After this register is written for the
first time, it cannot be rewritten unless a reset occurs.
Ad-
dress:
$0037
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 7
Write:
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset: 1
1
1
1
1
1
1
1
Figure 9-38. PWM Disable Mapping Write-Once Register (DISMAP)
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor Pulse-Width Modulator for Motor Control (PWMMC)
Technical Data
179