SH7730 Datasheet, PDF (872/1188 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7780 Series

Section 25 SIM Card Module (SIM)
25.3.4 Transmit Shift Register (SCTSR)
SCTSR is a shift register that transmits serial data.
The smart card interface transfers transmit data from the transmit data register (SCTDR) to
SCTSR, and then sends the data in order from the LSB or MSB to the SIM_TXD pin to perform
serial data transmission.
When data transmission of one byte has been completed and SCTSR being empty is detected, the
transmit data written to SCTDR is automatically transferred to SCTSR, and transmission is
initiated. When the TDRE flag in the serial status register (SCSSR) is set to 1, no data is
transferred from SCTDR to SCTSR.
25.3.5 Transmit Data Register (SCTDR)
SCTDR is an 8-bit readable/writable register that stores data for serial transmission.
When the smart card interface detects a vacancy in the transmit shift register (SCTSR), transmit
data written to SCTDR is transferred to SCTSR, and serial transmission is initiated. During
SCTSR serial data transmission, if the next transmit data is written to SCTDR, continuous serial
transmission is possible.
Bit: 7
6
5
4
3
2
1
0
SCTDR[7:0]
Initial value: 1
1
1
1
1
1
1
1
R/W: R/W R/W R/W R/W R/W R/W R/W R/W
Bit
7 to 0
Bit Name
Initial
Value
SCTDR[7:0] H'FF
R/W Description
R/W Transmit Data
Store data for serial transmission.
Rev. 1.00 Sep. 19, 2007 Page 824 of 1136
REJ09B0359-0100