HD6432633 Datasheet, PDF (878/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

18.2.7 Serial Control Register X (SCRX)
Bit
:7
6
5
4
3
2
1
0
—
IICX1 IICX0 IICE FLSHE —
—
—
Initial value : 0
0
0
0
0
0
0
0
R/W
: R/W
R/W R/W
R/W R/W R/W
R/W R/W
SCRX is an 8-bit readable/writable register that controls register access, the I²C interface
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.
Bits 6 and 5—I²C Transfer Select 1 and 0 (IICX1 and IICX0): These bits, together with bits
CKS2 to CKS0 in ICMR of IIC1 and IIC0, select the transfer rate in master mode. For details, see
section 18.2.4, I²C Bus Mode Register (ICMR).
Bit 4—I²C Master Enable (IICE): Controls CPU access to the I²C bus interface data and control
registers (ICCR, ICSR, ICDR/SARX, and ICMR/SAR).
Bit 4
IICE
0
1
Description
CPU access to I²C bus interface data and control registers is disabled
CPU access to I²C bus interface data and control registers is enabled
(Initial value)
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.
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