18.4.1.3.2 Function
The SERV register provides the interface from the CPU to the EWM module. It is write-
only and reads of this register return zero.
18.4.1.3.3 Diagram
Bits
7
6
5
4
3
2
1
0
R
0
W
Reset
0
0
0
0
0
0
0
0
18.4.1.3.4 Fields
Field
Function
7-0
SERVICE
SERVICE
The EWM refresh mechanism requires the CPU to write two values to the SERV register: a first data byte
of 0xB4, followed by a second data byte of 0x2C. The EWM refresh is invalid if either of the following
conditions is true.
• The first or second data byte is not written correctly.
• The second data byte is not written within a fixed number of peripheral bus cycles of the first data
byte. This fixed number of cycles is called
EWM_refresh_time
.
15 peripheral bus clock cycles are required for
EWM_refresh_time
18.4.1.4 Compare Low Register (CMPL)
18.4.1.4.1 Offset
Register
Offset
CMPL
2h
18.4.1.4.2 Function
The CMPL register is reset to zero after a CPU reset. This provides no minimum time for
the CPU to refresh the EWM counter.
Chapter 18 External Watchdog Monitor (EWM)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
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Содержание MWCT101 S Series
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