Serial Mode Register (Smr) - Renesas H8S Series Hardware Manual

15.2.3

Serial Mode Register (SMR)

Bit : 7
GM
Initial value : 0
Set value* : GM
R/W : R/W
Note: * When the Smart Card interface is used, be sure to make the 0 or 1 setting shown for bits 6, 5, 3, and 2.
The function of bit 7 of SMR changes in Smart Card interface mode.
Bit 7—GSM Mode (GM): Sets the Smart Card interface function to GSM mode.
This bit is cleared to 0 when the normal Smart Card interface is used. In GSM mode, this bit is set to 1, the timing of
setting of the TEND flag that indicates transmission completion is advanced and clock output control mode addition is
performed. The contents of the clock output control mode addition are specified by bits 1 and 0 of the serial control
register (SCR).
Bit 7
GM
0
1
Note: etu: Elementary time unit (time for transfer of 1 bit)
Bits 6 to 0—Operate in the same way as for the normal SCI.
For details, see section 14.2.5, Serial Mode Register (SMR).
Rev.6.00 Oct.28.2004 page 522 of 1016
REJ09B0138-0600H
6 5
CHR PE
0 0
0 1
R/W R/W
Description
Normal Smart Card interface mode operation
•
TEND flag generation 12.5 etu after beginning of start bit
•
Clock output ON/OFF control only
GSM mode Smart Card interface mode operation
•
TEND flag generation 11.0 etu after beginning of start bit
•
High/low fixing control possible in addition to clock output ON/OFF control (set by
SCR)
4 3 2
O/E STOP MP
0 0 0
O/E 1 0
R/W R/W R/W
1 0
CKS1 CKS0
0 0
CKS1 CKS0
R/W R/W
(Initial value)