25-26
MC9328MX1 Reference Manual
MOTOROLA
SmartCard Interface Module (SIM)
25.6.4 Transmit/Receive Enable Register
The Transmit/Receive Enable Register (ENABLE) enables and disables the SIM and its transmitter and
receiver. The bit descriptions and settings for the ENABLE register are provided in Table 25-12.
Table 25-11. Receive Threshold Register Description
Name
Description
Reserved
Bits 31–5
Reserved—These bits are reserved and should read 0.
RDT
Bits 4–0
Receive Data Threshold
—Determines the number of unread bytes that must exist in the FIFO to
trigger the receive data register full (RDRF) interrupt flag. When the number of unread bytes in the
receive FIFO is greater than or equal to the value in RDT, the RDRF flag in the RCV_STATUS
register is set. A value of zero indicates that there must be 32 unread bytes in the FIFO to trigger the
RDRF. The RDT value can be altered at any time, and the RDRF flag is updated accordingly.
ENABLE
Transmit/Receive Enable Register
Addr
0x0021100C
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
XMT_EN
RCV_EN
SIM_EN
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 25-12. Transmit/Receive Enable Register Description
Name
Description
Settings
Reserved
Bits 31–3
Reserved—These bits are reserved and should read 0.
XMT_EN
Bit 2
Transmit Enable
—Enables/Disables the SIM transmit state machine. When
the SIM is receiving data, XMT_EN must be deasserted. This bit also enables
the XMT_CLK and RCV_CLK inputs to the general purpose counter.
Note:
Setting (transition from 0 to 1) resets the CRC and LRC values.
0
=
SIM transmitter
disabled
1
=
SIM transmitter
enabled
RCV_EN
Bit 1
Receiver Enable
—Enables/Disables the SIM receive state machine. The
RCV_EN bit must be left high whenever the SIM is in use. The SIM has an
automatic receive mode operation that disables the reception of characters
when the transmitter is operational. When the transmitter has completed
sending the last character, the receiver is automatically enabled. This bit also
enables the RCV_CLK input to the general purpose counter.
0
=
SIM receiver
disabled
1
=
SIM receiver
enabled
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