504
Table 15.7
Maximum Bit Rates for Frequencies (Smart Card Interface Mode)
P
φ
(MHz)
Maximum Bit Rate (Bits/s)
N
n
7.1424
9600
0
0
10.00
13441
0
0
10.7136
14400
0
0
13.00
17473
0
0
14.2848
19200
0
0
16.00
21505
0
0
18.00
24194
0
0
The bit rate error is found as follows:
Error (%) = (
×
10
6
– 1
×
100)
1488
×
2
2n–1
×
B
×
(N + 1)
φ
P
Table 15.8 shows the relationship between transmit/receive clock register set values and output
states on the smart card interface.
Table 15.8
Register Set Values and SCK Pin
Register Value
SCK Pin
Setting
SMIF
C/
A
CKE1
CKE0
Output
State
1
*
1
1
0
0
0
Port
Determined by setting of port
register SCP1MD1 and
SCP1MD0 bits
1
0
0
1
SCK (serial clock) output state
2
*
2
1
1
0
0
Low output
Low output state
1
1
0
1
SCK (serial clock) output state
3
*
2
1
1
1
0
High output
High output state
1
1
1
1
SCK (serial clock) output state
Notes:
*
1 The SCK output state changes as soon as the CKE0 bit is modified. The CKE1 bit
should be cleared to 0.
*
2 The clock duty remains constant despite stopping and starting of the clock by
modification of the CKE0 bit.
Summary of Contents for SH7709S
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