163
Clock Generator
Chapter 4
Preliminary User’s Manual U17566EE1V2UM00
4.2.5
Clock monitor registers
The following registers are used to control the monitor circuits of the main
oscillator clock and the sub oscillator clock.
Please refer to
“Operation of the Clock Monitors” on page 185
for
supplementary information.
(1)
CLMM - Main oscillator clock monitor mode register
The 8-bit CLMM register is used to enable the monitor for the main oscillator
clock.
Access
This register can be read/written in 8-bit or 1-bit units.
Writing to this register is protected by a special sequence of instructions.
Please refer to
“PRCMDCMM - CLMM write protection register” on page 164
for details.
Address
FFFF F870
H
.
Initial Value
00
H
. This register is cleared by any reset.
Note
CLMM.CLMEM can be set at any time. However, the clock monitor is only
activated after the main oscillator has stabilized, indicated by
CGSTAT.OSCSTAT = 1.
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
CLMEM
R
R
R
R
R
R
R
R/W
Table 4-21
CLMM register contents
Bit position
Bit name
Function
0
CLMEM
Clock monitor enable:
0: Clock monitor
for
main oscillator disabled.
1: Clock monitor for main oscillator enabled.
This bit can only be cleared by reset.
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