MS51
Nov. 28, 2019
Page
390
of 491
Rev 1.00
MS51
32K
SE
RIES
TE
CHNICAL RE
F
EREN
CE MA
N
UAL
The warm reset sequence is showed in Figure 15.3-3
1. Set SCn
_RST to low by software programming to ‘0’ before timing T4.
2. Set SCn_DAT to high by software p
rogramming to ‘1’ period of timing T4.
3. Set SCn
_RST to high by software programming to ‘1’ after timing T5.
4. ISO 7816-3 host controller read the card ATR period of timing T6.
Undefined
T6
ATR
T4
T5
T4
Comment
Note: This value is measured by chip IO pin, the real value will depended on system design
Time
81
129
161
161
483
531
563
42106
T4
T5
T5
T6
Suggesting timing (Unit SC Clock)
400 <= T6 <= 40000
SC_DAT
SC_RST
SC_RST to SC_DAT Reception Mode
SC_DAT Reception Mode to SC_RST Assert
SC_RST start to ATR Appear
Figure 15.3-3 SC Warm Reset Sequence
Deactivation
The deactivation sequence is showedin Figure 15.3-4
1. Set SCn
_RST to low by software programming to ‘0’ period of timing T7.
2. Stop SCn
_CLK by programming CLKKEEP (SCCR2[1]) to ‘0’ period of timing T8.
3. Set SCn
_DAT to low by software programming to ‘0’ period of timing T8.
4. Deactivate SCn
_PWR by software programming to ‘0’ period of timing T9.