Cmsemicon CMS32L051 - EPWM Force Truncated Output Selection Register (EPWMSTL); EPWM Status Register (EPWMSTR)

V1.2.2
CMS32L051 User Manual |Chapter 6 Function of EPWM Output Control Circuit
www.mcu.com.cn 209 / 703
6.2.5 EPWM force truncated output selection register (EPWMSTL)
The output state of the EPWMO terminal when the EPWMSTL register is forcibly truncated.
The EPWMSTL registers are set via 16-bit memory operation instructions.
After the reset signal is generated, the value of this register becomes 00H.
Figure 6-5 Format of EPWM force truncated output selection register (EPWMSTL)
Address: 0x4004440C
After reset:
0000H
R/
W
symbol
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
EPWMSTL
IO71
IO70
IO61
IO60
IO51
IO50
IO41
IO40
IO31
IO30
IO21
IO20
IO11
IO10
IO01
IO00
IONo. 1
IOn0
Selection of terminal output when truncated
0
0
Truncation is prohibited
0
1
HI-Z output
1
0
Low level output
1
1
High level output
Note n: Channel number (n=0~7).
6.2.6 EPWM status register (EPWMSTR)
The EPWMSTR register clears the forced truncation signal and displays the truncation status. If the clear
trigger bit HZCLR is set to 1, the truancy state is released. When the truncation status indicates that the
signal of the SHTFLG is high, it enters the forced truncation state. bit0 is write-only bit, and the read value is
always 0. bit7~1 is read-only.
The EPWMSTR registers are set via 8-bit memory operation instructions.
After the reset signal is generated, the value of this register becomes 00H.
Figure 6-6 Format of EPWM status register (EPWMSTR)
Address: 0x4004410
After reset: 0000H
R/W
symbol
7
6
5
4
3
2
1
0
EPWMSTR
0
0
0
0
0
0
SHTFLG
HZCLR
SHTFLG
Force truncation status flag
0
Normal output state
1
Force truncation state
HZCLR
Software clearance to force truncation signals
0
-
1
The software dismisses the truncation state
Note: When the Output Selection Register (EPWMSTL) is set to disable cut-off by forcing truncation, the SHTFLG is set
to 1 because of the input from an external truncation source, but truncation is not performed.