652
STCR—Serial/Timer Control Register
H'C3
System Control
Bit
Initial value
Read/Write
7
IICS
0
R/W
6
IICD
0
R/W
5
IICX
0
R/W
4
IICE
0
R/W
3
STAC
0
R/W
0
ICKS0
0
R/W
2
MPE
0
R/W
1
ICKS1
0
R/W
Internal Clock Source Select
See TCR under TMR0 and TMR1.
Multiprocessor Enable
0
1
Multiprocessor communication function is disabled.
Multiprocessor communication function is enabled.
Slave Mode Control Input Switch
0
1
ECS
2
and EIOW are enabled
I
2
C Master Enable
I
2
C bus interface data registers and control registers are disabled (initial value)
I
2
C bus interface data registers and control registers are enabled
I
2
C Trans
CS
2
and IOW are enabled
0
1
I
2
C Extra Buffer Reserve
I
2
C Extra Buffer Select
0
1
PA
7
to PA
4
are normal input/output pins
7
to PA
4
are selected for bus drive
IICX
CKS2
*
2
CKS1
*
2
CKS0
*
2
Clock
Transfer Rate
*
1
Notes:
*
1
P
= .
*
2 CKS2 to CKS0 are bits 2 to 0 of the I
2
C bus control register in the I
2
C bus interface.
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
P
/28
P
/40
P
/48
P
/64
P
/80
P
/100
P
/112
P
/128
P
/56
P
/80
P
/96
P
/128
P
/160
P
/200
P
/224
P
/256
143 kHz
100 kHz
83.3 kHz
62.5 kHz
50.0 kHz
40.0 kHz
35.7 kHz
31.3 kHz
71.4 kHz
50.0 kHz
41.7 kHz
31.3 kHz
25.0 kHz
20.0 kHz
17.9 kHz
15.6 kHz
P
= 4 MHz
P
= 5 MHz
P
= 8 MHz
P
= 10 MHz
P
= 16 MHz
179 kHz
125 kHz
104 kHz
78.1 kHz
62.5 kHz
50.0 kHz
44.6 kHz
39.1 kHz
89.3 kHz
62.5 kHz
52.1 kHz
39.1 kHz
31.3 kHz
25.0 kHz
22.3 kHz
19.5 kHz
31.3 kHz
286 kHz
200 kHz
167 kHz
125 kHz
100 kHz
80.0 kHz
71.4 kHz
62.5 kHz
143 kHz
100 kHz
83.3 kHz
62.5 kHz
50.0 kHz
40.0 kHz
35.7 kHz
357 kHz
250 kHz
208 kHz
156 kHz
125 kHz
100 kHz
89.3 kHz
78.1 kHz
179 kHz
125 kHz
104 kHz
78.1 kHz
62.5 kHz
50.0 kHz
44.6 kHz
39.1 kHz
571 kHz
400 kHz
333 kHz
250 kHz
200 kHz
160 kHz
143 kHz
125 kHz
286 kHz
200 kHz
167 kHz
125 kHz
100 kHz
80.0 kHz
71.4 kHz
62.5 kHz