HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 1056

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 30
30.3.4
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 is completed, transmit data is automatically transferred from
SCTDR 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.
Direct reading and writing of SCTSR from the CPU or DMAC is not possible.
30.3.5
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.
Rev. 3.00 Jan. 18, 2008 Page 994 of 1458
REJ09B0033-0300
Bit
1
0
Bit
7 to 0
Bit Name
CKE1
CKE0
Bit Name
SCTD7 to
SCTD0
Transmit Shift Register (SCTSR)
Transmit Data Register (SCTDR)
SIM Card Module (SIM)
Initial
Value
0
0
Initial
Value
All 1
R/W
R/W
R/W
R/W
R/W
Description
Clock Enable 1, 0
Select the clock source for the smart card interface, and
enable/disable clock output from the SIM_CLK pin.
00: Fix the output pin at low
01: Clock output as the output pin
10: Fix the output pin at high
11: Clock output as the output pin
Description
Transmit Data
Store data for serial transmission.