Transmit Status Register; Table 25-13 Transmit Status Register Description - Motorola DragonBall MC9328MX1 Reference Manual

Table 25-12. Transmit/Receive Enable Register Description (Continued)
Name
SIM_EN SIM Enable—Enables/Disables the entire SIM. The SIM_EN bit must be set
Bit 0 high first whenever the SIM is in use. The SIM enters power saving mode
when SIM_EN is low. All internal circuitry is reset to the default state which
allows maximum saving on the power when the SIM is not in use.

25.6.5 Transmit Status Register

The Transmit Status Register (XMT_STATUS) provides the status of the SIM transmitter and its FIFO.
The bit descriptions and settings for the Transmit Status Register are provided in Table 25-13.
XMT_STATUS
BIT 31 30
TYPE r r
0 0
RESET
BIT 15 14
TYPE r r
0 0
RESET
Name
Reserved Reserved—These bits are reserved and should read 0.
Bits 31–7
GPCNT General Purpose Counter Flag—Indicates when the
Bit 6 general purpose counter has reached the value in the
GPCNT register. The GPCNT flag creates an interrupt when
GPCNTM in the INT_MASK register is low. The GPCNT bit is
cleared by writing 1 to it.
TDTF Transmit Data Threshold Flag—Indicates when the number
Bit 5 of bytes in the transmit FIFO is less than or equal to the value
programmed in the TDT bits in the XMT_THRESHOLD
register. The TDTF creates an interrupt when TDTFM in the
INT_MASK register is low.
TFO Transmit FIFO Overfill Error—Indicates when the Transmit
Bit 4 FIFO has been written with more than 16 bytes. The TFO flag
creates an interrupt when the TFOM bit in the INT_MASK
register is low. The TFO bit is cleared by writing 1 to it.
MOTOROLA
Description
Transmit Status Register
29 28 27 26 25
r r r r r
0 0 0 0 0
13 12 11 10 9
r r r r r
0 0 0 0 0
Table 25-13. Transmit Status Register Description
Description
SmartCard Interface Module (SIM)
24 23 22 21
r r r r
0 0 0 0
0x0000
8 7 6 5
GPCNT TDTF
r r rw r
0 0 0 1
0x002E
0 = GPCNT time not reached, or bit
1 = General purpose counter has
0 = Number of bytes in the FIFO is
1 = Number of bytes in the FIFO is
0 = No transmit FIFO overfill error
1 = A transmit FIFO overfill error has
Programming Model
Settings
0 = SIM disabled
1 = SIM enabled
Addr
0x00211010
20 19 18 17
r r r r
0 0 0 0
4 3 2 1
TF0 TC ETC TFE
rw rw rw rw
0 1 1 1
Settings
has been cleared
reached the GPCNT value
greater than TFT, or bit has
been cleared
less than or equal to TFT
has occurred
occurred
25-27
16
r
0
0
XTE
rw
0