HD64F3028F25 Datasheet, PDF (552/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Bits 6 to 0: These bits operate as in normal serial communication. For details see section 13.2.5,
Serial Mode Register (SMR).
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
RIE
0
R/W
5
TE
0
R/W
4
3
2
1
0
RE MPIE TEIE CKE1 CKE0
0
0
0
0
0
R/W R/W R/W R/W 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.
• In transmission, a guard time of at least 2 etu (elementary time units: the time for transfer of
one bit) is provided between the end of the parity bit and the start of the next frame.
Rev. 2.00, 09/03, page 520 of 890