V104
Appendix C: UART SCC2691
C-3
ACR (Auxiliary Control Register):
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
BRG Set
Select
Counter/Timer Mode and Source
Power-
Down
Mode
MPO Pin Function Select
0 = Baud
rate set 1,
see CSR
bit format
1 = Baud
rate set 2,
see CSR
bit format
0 = counter, MPI pin
1 = counter, MPI pin divided by
16
2 = counter, TxC-1x clock of the
transmitter
3 = counter, crystal or external
clock (x1/CLK)
4 = timer, MPI pin
5 = timer, MPI pin divided by
16
6 = timer, crystal or external
clock (x1/CLK)
7 = timer, crystal or external
clock (x1/CLK) divided by 16
0 = on,
power
down
active
1 = off
normal
0 = RTSN
1 = C/TO
2 = TxC (1x)
3 = TxC (16x)
4 = RxC (1x)
5 = RxC (16x)
6 = TxRDY
7 = RxRDY/FFULL
ISR (Interrupt Status Register):
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
MPI Pin
Change
MPI Pin
Current
State
Not Used
Counter
Ready
Delta
Break
RxRDY/
FFULL
TxEMT
TxRDY
0 = no
1 = yes
0 = low
1 = high
0 = no
1 = yes
0 = no
1 = yes
0 = no
1 = yes
0 = no
1 = yes
0 = no
1 = yes
IMR (Interrupt Mask Register):
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
MPI
Change
Interrupt
MPI
Level
Interrupt
Not Used
Counter
Ready
Interrupt
Delta
Break
Interrupt
RxRDY/
FFULL
Interrupt
TxEMT
Interrupt
TxRDY
Interrupt
0 = off
1 = 0n
0 = off
1 = 0n
0 = off
1 = 0n
0 = off
1 = 0n
0 = off
1 = 0n
0 = off
1 = 0n
0 = off
1 = 0n
CTUR (Counter/Timer Upper Register):
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
C/T [15]
C/T [14]
C/T [13]
C/T [12]
C/T [11]
C/T [10]
C/T [9]
C/T [8]
CTLR (Counter/Timer Lower Register):
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
C/T [7]
C/T [6]
C/T [5]
C/T [4]
C/T [3]
C/T [2]
C/T [1]
C/T[0]