HD64F3437TF16 Datasheet, PDF (685/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

STCR—Serial/Timer Control Register
Bit
Initial value
Read/Write
7
6
5
IICS
IICD
IICX
0
0
0
R/W
R/W
R/W
H'C3
System Control
4
3
2
1
0
IICE STAC MPE ICKS1 ICKS0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
Internal Clock Source Select
See TCR under TMR0 and TMR1.
Multiprocessor Enable
0 Multiprocessor communication function is disabled.
1 Multiprocessor communication function is enabled.
Slave Mode Control Input Switch
0 CS₂ and IOW are enabled
1 ECS₂ and EIOW are enabled
I²C Master Enable
0 I²C bus interface data registers and control registers are disabled (initial value)
1 I²C bus interface data registers and control registers are enabled
I²C Transfer Rate Select
IICX CKS2^*2 CKS1^*2 CKS0^*2 Clock
Transfer Rate^*1
ø_P = 4 MHz ø_P = 5 MHz ø_P = 8 MHz ø_P = 10 MHz ø_P = 16 MHz
0
0
0
0 ø_P/28 143 kHz 179 kHz 286 kHz 357 kHz 571 kHz
1 ø_P/40 100 kHz 125 kHz 200 kHz 250 kHz 400 kHz
1
0 ø_P/48 83.3 kHz 104 kHz 167 kHz 208 kHz 333 kHz
1 ø_P/64 62.5 kHz 78.1 kHz 125 kHz 156 kHz 250 kHz
1
0
0 ø_P/80 50.0 kHz 62.5 kHz 100 kHz 125 kHz 200 kHz
1 ø_P/100 40.0 kHz 50.0 kHz 80.0 kHz 100 kHz 160 kHz
1
0 ø_P/112 35.7 kHz 44.6 kHz 71.4 kHz 89.3 kHz 143 kHz
1 ø_P/128 31.3 kHz 39.1 kHz 62.5 kHz 78.1 kHz 125 kHz
1
0
0
0 ø_P/56 71.4 kHz 89.3 kHz 143 kHz 179 kHz 286 kHz
1 ø_P/80 50.0 kHz 62.5 kHz 100 kHz 125 kHz 200 kHz
1
0 ø_P/96 41.7 kHz 52.1 kHz 83.3 kHz 104 kHz 167 kHz
1 ø_P/128 31.3 kHz 39.1 kHz 62.5 kHz 78.1 kHz 125 kHz
1
0
0 ø_P/160 25.0 kHz 31.3 kHz 50.0 kHz 62.5 kHz 100 kHz
1 ø_P/200 20.0 kHz 25.0 kHz 40.0 kHz 50.0 kHz 80.0 kHz
1
0 ø_P/224 17.9 kHz 22.3 kHz 35.7 kHz 44.6 kHz 71.4 kHz
1 ø_P/256 15.6 kHz 19.5 kHz 31.3 kHz 39.1 kHz 62.5 kHz
Notes: *1 ø_P = ø.
*2 CKS2 to CKS0 are bits 2 to 0 of the I²C bus control register in the I²C bus interface.
I²C Extra Buffer Reserve
I²C Extra Buffer Select
0 PA₇ to PA₄ are normal input/output pins
1 PA₇ to PA₄ are selected for bus drive
656