SH7751 Datasheet, PDF (821/1224 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

17. Smart Card Interface
Bit 0—Smart Card Interface Mode Select (SMIF): Enables or disables the smart card interface
function.
Bit 0: SMIF
0
1
Description
Smart card interface function is disabled
Smart card interface function is enabled
(Initial value)
17.2.2 Serial Mode Register (SCSMR1)
Bit 7 of SCSMR1 has a different function in smart card interface mode.
Bit:
7
6
5
GM(C/A) CHR
PE
4
3
2
O/E
STOP
MP
Initial value:
0
0
0
0
0
0
R/W: R/W
R/W
R/W
R/W
R/W
R/W
1
CKS1
0
R/W
0
CKS0
0
R/W
Bit 7—GSM Mode (GM): Sets the smart card interface function to GSM mode.
With the normal smart card interface, this bit is cleared to 0. Setting this bit to 1 selects GSM
mode, an additional mode for controlling the timing for setting the TEND flag that indicates
completion of transmission, and the type of clock output used. The details of the additional clock
output control mode are specified by the CKE1 and CKE0 bits in the serial control register
(SCSCR1). In GSM mode, the pulse width is guaranteed when SCK start/stop specifications are
made by CKE1 and CKE0.
Bit 7: GM
0
Description
Normal smart card interface mode operation
(Initial value)
• The TEND flag is set 12.5 etu after the beginning of the start bit
• Clock output on/off control only
1
GSM mode smart card interface mode operation
• The TEND flag is set 11.0 etu after the beginning of the start bit
• Clock output on/off and fixed-high/fixed-low control (set in SCSCR1)
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. See section 15, Serial Communication
Interface (SCI), for details. With the smart card interface, the following settings should be used:
CHR = 0, PE = 1, STOP = 1, MP = 0.
Rev.4.00 Oct. 10, 2008 Page 723 of 1122
REJ09B0370-0400