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Section 13 Serial Communication Interface
Smart Card Interface
• One frame consists of 8-bit data and a parity bit.
• In transmitting, a guard time of at least two elementary time units (2 etu) is provided between
the end of the parity bit and the start of he next frame. (An elementary time unit is the time
required to transmit one bit.)
• In receiving, if a parity error is detected, a low error signal level is output for 1 etu, beginning
10.5 etu after the start bit..
• In transmitting, if an error signal is received, the same data is automatically transmitted again
after at least 2 etu.
• Only asynchronous communication is supported. There is no synchronous communication
function.
For details of smart card interface operation, see section 14, Smart Card Interface.
Table 13.8 SMR Settings and Serial Communication Formats
SMR Settings
Bit 7
Bit 6
Bit 2
C/A A A A
CHR
MP
0
0
0
1
0
1
1
1
—
—
Rev. 4.00 Jan 26, 2006 page 508 of 938
REJ09B0276-0400
Bit 5
Bit 3
PE
STOP Mode
0
0
AsynChronous
mode
1
1
0
1
0
0
1
1
0
1
—
0
Asynchronous
mode (multi-
—
1
processor
—
0
format)
—
1
—
—
Synchronous
mode
SCI Communication Format
Multi-
Data
processor
Length
Bit
8-bit data
Absent
7-bit data
8-bit data
Present
7-bit data
8-bit data
Absent
Parity
Stop Bit
Bit
Length
Absent
1 bit
2 bits
Present
1 bit
2 bits
Absent
1 bit
2 bits
Present
1 bit
2 bits
Absent
1 bit
2 bits
1 bit
2 bits
None
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