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131
SYSCR System Control Register
Clock Pulse Generator
7
—
0
R
6
—
0
R
5
—
0
R
4
—
0
R
3
—
0
R
0
CPUCS0
0
R/W
2
—
0
R
1
—
0
R
Bit
Initial value
Read/Write
CPU Clock Select 0
0
1
One-half frequecny
of the external clock
External clock frequency
TCWA Timer Counter Write Address
WDT
7
IA15
1
R/W
6
IA14
1
R/W
5
IA13
1
R/W
4
IA12
1
R/W
3
—
1
R
0
WAD
1
R/W
2
—
1
R
1
—
1
R
Bit
Initial value
Read/Write
Write Address Disable
Instruction Address
0
1
TCWA operates
TCWA does not operate