25-36
MC9328MX1 Reference Manual
MOTOROLA
SmartCard Interface Module (SIM)
25.6.12 Transmit Guard Control Register
The bit descriptions and settings for the Transmit Guard Control Register (GUARD_CNTL) are provided
in Table 25-20.
GUARD_CNTL
Transmit Guard Control Register
Addr
0x0021102C
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RCVR11
GETU
TYPE
r
r
r
r
r
r
r
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 25-20. Transmit Guard Control Register Description
Name
Description
Settings
Reserved
Bits 31–9
Reserved—These bits are reserved and should read 0.
RCVR11
Bit 8
Receiver Uses 11 ETUs
—Configures the SIM receiver for 11
ETU operations (1 Stop bit) to provide support for T = 1 cards.
See Section 25.9.4, “Using the SIM Transmit with T = 1
SmartCards,” on page 25-50 for details on configuring the SIM
receiver for T = 1 operation.
0
=
Receiver configured for 12
ETU operations
1
=
Receiver configured for 11
ETU operations
GETU
Bits 7–0
Transmit Guard ETUs
—Controls the number of additional ETUs inserted between bytes transmitted
by the SIM transmitter. An ETU is equivalent to one bit-time at the given baud rate (the length of a
start bit). The guard time has no effect on the SIM receiver. A value of 0x00 inserts no additional
ETUs, while a value of 0xFE inserts 254 additional ETUs. A value of 0xFF subtracts one ETU by
reducing the number of STOP bits from two to one.
Summary of Contents for DragonBall MC9328MX1
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Page 86: ...2 18 MC9328MX1 Reference Manual MOTOROLA Signal Descriptions and Pin Assignments ...
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Page 160: ...8 8 MC9328MX1 Reference Manual MOTOROLA System Control ...
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Page 670: ...24 72 MC9328MX1 Reference Manual MOTOROLA SDRAM Memory Controller ...
Page 726: ...25 56 MC9328MX1 Reference Manual MOTOROLA SmartCard Interface Module SIM ...
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