Information

22.2 EWM Signal Descriptions
The EWM has two external signals, as shown in the following table.
Table 22-1. EWM Signal Descriptions
Signal Description I/O
EWM_in EWM input for safety status of external safety circuits. The polarity of
EWM_in is programmable using the EWM_CTRL[ASSIN] bit. The default
polarity is active-low.
I
EWM_out EWM reset out signal O
22.3 Memory Map/Register Definition
This section contains the module memory map and registers.
EWM memory map
Absolute
address
(hex)
Register name
Width
(in bits)
Access Reset value
Section/
page
4006_1000 Control Register (EWM_CTRL) 8 R/W 00h 22.3.1/400
4006_1001 Service Register (EWM_SERV) 8
W
(always
reads
zero)
00h 22.3.2/401
4006_1002 Compare Low Register (EWM_CMPL) 8 R/W 00h 22.3.3/402
4006_1003 Compare High Register (EWM_CMPH) 8 R/W FFh 22.3.4/402
22.3.1 Control Register (EWM_CTRL)
The CTRL register is cleared by any reset.
NOTE
INEN, ASSIN and EWMEN bits can be written once after a
CPU reset. Modifying these bits more than once, generates a
bus transfer error.
EWM Signal Descriptions
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
400 Freescale Semiconductor, Inc.