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18.2.7
Serial Control Register X (SCRX)
Bit
:
Initial value :
R/W
:
SCRX is an 8-bit readable/writable register that controls register access, the I
operating mode (when the on-chip IIC option is included), and on-chip flash memory control (F-
ZTAT versions). If a module controlled by SCRX is not used, do not write 1 to the corresponding
bit.
SCRX is initialized to H'00 by a reset and in hardware standby mode.
Bit 7—Reserved: Do not set 1.
2
Bit 6—I
C Transfer Select 1 (IICX1): This bit, together with bits CKS2 to CKS0 in ICMR of
IIC1, selects the transfer rate in master mode. For details, see section 18.2.4, I
Register (ICMR).
2
Bit 5—I
C Transfer Select 0 (IICX0): This bit, together with bits CKS2 to CKS0 in ICMR of
IIC0, selects the transfer rate in master mode. For details, see section 18.2.4, I
Register (ICMR).
2
Bit 4—I
C Master Enable (IICE): Controls CPU access to the I
registers (ICCR, ICSR, ICDR/SARX, ICMR/SAR).
Bit 4
IICE
Description
0
CPU access to I
1
CPU access to I
Bit 3—Flash Memory Control Register Enable (FLSHE): Controls the operation of the flash
memory in F-ZTAT versions. For details, see section 22, ROM.
Bits 2 to 0—Reserved: Do not set 1.
716
7
6
—
IICX1
0
0
R/W
R/W
2
C bus interface data and control registers is disabled
2
C bus interface data and control registers is enabled
5
4
IICX0
IICE
FLSHE
0
0
R/W
R/W
3
2
—
0
0
R/W
R/W
2
C interface
2
C Bus Mode
2
C Bus Mode
2
C bus interface data and control
1
0
—
—
0
0
R/W
R/W
(Initial value)
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