32.8.3. Control C
Name:
CTRLC
Offset:
0x08
Reset:
0x00000000
Property:
PAC Write-Protection, Enable-Protected
Bit
31
30
29
28
27
26
25
24
Access
Reset
Bit
23
22
21
20
19
18
17
16
MAXITER[2:0]
DSNACK
INACK
Access
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
Bit
15
14
13
12
11
10
9
8
Access
Reset
Bit
7
6
5
4
3
2
1
0
GTIME[2:0]
Access
R/W
R/W
R/W
Reset
0
0
0
Bits 22:20 – MAXITER[2:0]: Maximum Iterations
These bits define the maximum number of retransmit iterations.
These bits also define the successive NACKs sent to the remote transmitter when CTRLC.DSNACK is
set.
This field is only valid when using ISO7816 T=0 mode (CTRLA.MODE=0x7 and CTRLA.CMODE=0).
Value
Description
0
NACK is sent on the ISO line for every parity error received.
1
Successive parity errors are counted up to the value specified in CTRLC.MAXITER. These
parity errors generate a NACK on the ISO line. As soon as this value is reached, no
additional NACK is sent on the ISO line.
Bit 17 – DSNACK: Disable Successive Not Acknowledge
This bit controls how many times NACK will be sent on parity error reception.
This bit is only valid in ISO7816 T=0 mode and when CTRLC.INACK=0.
Atmel SAM L22G / L22J / L22N [DATASHEET]
Atmel-42402E-SAM L22G / L22J / L22N_Datasheet_Complete-07/2016
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