3069RF-ZTAT Datasheet, PDF (544/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

Bit 6: Only 0 should be written to this bit.
Bits 5 to 2: These bits operate as in normal serial communication. For details see section 13.2.5,
Serial Mode Register (SMR).
Bits 1 and 0: Only 0 should be written to these bits.
14.2.4 Serial Control Register (SCR)
The function of SCR bits 1 and 0 is modified in smart card interface mode
Bit
7
TIE
Initial value
0
Read/Write _R/W
6
5
RIE
TE
0
0
R/W R/W
4
RE
0
R/W
3
MPIE
0
R/W
2
TEIE
0
R/W
1
CKE1
0
R/W
0
CKE0
0
R/W
Bits 7 to 2: These bits operate as in normal serial communication. For details see section 13.2.6,
Serial Control Register (SCR).
Bits 1 and 0—Clock Enable 1 and 0 (CKE1, CKE0): These bits select the SCI clock source and
enable or disable clock output from the SCK pin. In smart card interface mode, it is possible to
specify a fixed high level or fixed low level for the clock output, in addition to the usual switching
between enabling and disabling of the clock output.
Bit 7
GM
0
1
Bit 1
CKE1
0
1
Bit 0
CKE0
0
1
0
1
0
1
Description
Internal clock/SCK pin is I/O port
(Initial value)
Internal clock/SCK pin is clock output
Internal clock/SCK pin is fixed at low output
Internal clock/SCK pin is clock output
Internal clock/SCK pin is fixed at high output
Internal clock/SCK pin is clock output
14.3 Operation
14.3.1 Overview
The main features of the smart card interface are as follows.
• One frame consists of 8-bit data plus a parity bit.
Rev. 5.0, 09/04, page 522 of 978