25-32
MC9328MX1 Reference Manual
MOTOROLA
SmartCard Interface Module (SIM)
25.6.8 Port Transmit Buffer Register
The bit descriptions and settings for the Port Transmit Buffer Register (XMT_BUF) are provided in
Table 25-16.
OIM
Bit 2
Overrun Interrupt Mask
—Enables/Disables the ability of the
OEF flag in the RCV_STATUS register to generate SIM
interrupts.
0 = OEF interrupt enabled
1 = OEF interrupt masked
TCIM
Bit 1
Transmit Complete Interrupt Mask
—Enables/Disables the
ability of the TC flag in the XMT_STATUS register to generate
SIM interrupts.
0 = TC interrupt enabled
1 = TC interrupt masked
RIM
Bit 0
Receive Interrupt Mask
—Enables/Disables the ability of the
RDRF flag in the RCV_STATUS register to generate SIM
interrupts.
0 = RDRF interrupt enabled
1 = RDRF interrupt masked
Note:
The other interrupt masks in the SIM design are the SDIM bit in the PORT_DETECT register.
XMT_BUF
Port Transmit Buffer Register
Addr
0x0021101C
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
TYPE
r
r
r
r
r
r
r
r
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 25-16. Port Transmit Buffer Register Description
Name
Description
Reserved
Bits 31–8
Reserved—These bits are reserved and should read 0.
XMT
Bits 7–0
Transmit Buffer
—Holds data for transmitting. This register contains the last data written to it. Upon
reset the value of the data in this register is undefined.
Note:
Writing more data to the transmit FIFO than it can hold (16 bytes) causes a transmit FIFO overfill error.
Table 25-15. Interrupt Mask Register Description (Continued)
Name
Description
Settings
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