Datasheet

Chapter 12 Pulse-Width Modulator (PWM8B6CV1)
MC9S12E128 Data Sheet, Rev. 1.07
402 Freescale Semiconductor
12.3.2.15 PWM Shutdown Register (PWMSDN)
The PWMSDN register provides for the shutdown functionality of the PWM module in the emergency
cases.
Read: anytime
Write: anytime
76543210
R
PWMIF PWMIE
0
PWMLVL
0 PWM5IN
PWM5INL PWM5ENA
W PWMRSTRT
Reset 0 0 0 00000
= Unimplemented or Reserved
Figure 12-33. PWM Shutdown Register (PWMSDN)
Table 12-10. PWMSDN Field Descriptions
Field Description
7
PWMIF
PWM Interrupt Flag — Any change from passive to asserted (active) state or from active to passive state will be
flagged by setting the PWMIF flag = 1. The flag is cleared by writing a logic 1 to it. Writing a 0 has no effect.
0 No change on PWM5IN input.
1 Change on PWM5IN input
6
PWMIE
PWM Interrupt Enable — If interrupt is enabled an interrupt to the CPU is asserted.
0 PWM interrupt is disabled.
1 PWM interrupt is enabled.
5
PWMRSTRT
PWM Restart — The PWM can only be restarted if the PWM channel input 5 is deasserted. After writing a logic 1
to the PWMRSTRT bit (trigger event) the PWM channels start running after the corresponding counter passes
next “counter = 0” phase.
Also, if the PWM5ENA bit is reset to 0, the PWM do not start before the counter passes 0x0000.
The bit is always read as 0.
4
PWMLVL
PWM Shutdown Output Level — If active level as defined by the PWM5IN input, gets asserted all enabled PWM
channels are immediately driven to the level defined by PWMLVL.
0 PWM outputs are forced to 0
1 PWM outputs are forced to 1.
2
PWM5IN
PWM Channel 5 Input Status — This reflects the current status of the PWM5 pin.
1
PWM5INL
PWM Shutdown Active Input Level for Channel 5 — If the emergency shutdown feature is enabled
(PWM5ENA = 1), this bit determines the active level of the PWM5 channel.
0 Active level is low
1 Active level is high
0
PWM5ENA
PWM Emergency Shutdown Enable — If this bit is logic 1 the pin associated with channel 5 is forced to input
and the emergency shutdown feature is enabled. All the other bits in this register are meaningful only if
PWM5ENA = 1.
0 PWM emergency feature disabled.
1 PWM emergency feature is enabled.