Freescale Semiconductor, Inc.
Address
700
FC
Register Read (R/W = 1)
MCR (HIGH BYTE)
Register Write (R/W = 0)
1
S
MCR (HIGH BYTE)
MCR (LOW BYTE)
701
S
S
S
S
S
MCR (LOW BYTE)
3
3
702
DO NOT ACCESS
DO NOT ACCESS
3
3
703
DO NOT ACCESS
DO NOT ACCESS
704
INTERRUPT LEVEL (ILR)
NTERRUPT LEVEL (ILR)
705
INTERRUPT VECTOR (IVR)
INTERRUPT VECTOR (IVR)
2
710
711
712
713
714
715
716
717
718
719
71A
71B
71C
71D
71E
71F
720
721
S/U
S/U
S/U
S/U
S/U
S/U
S/U
S/U
S/U
S/U
S/U
S/U
S/U
S/U
S/U
S/U
S/U
S/U
MODE REGISTER 1A (MR1A)
STATUS REGISTER A (SRA)
MODE REGISTER 1A (MR1A)
CLOCK-SELECT REGISTER A (CSRA)
COMMAND REGISTER A (CRA)
3
DO NOT ACCESS
RECEIVER BUFFER A (RBA)
INPUT PORT CHANGE REGISTER (IPCR)
INTERRUPT STATUS REGISTER (ISR)
TRANSMITTER BUFFER A (TBA)
AUXILIARY CONTROL REGISTER (ACR)
INTERRUPT ENABLE REGISTER (IER)
3
3
DO NOT ACCESS
DO NOT ACCESS
3
3
DO NOT ACCESS
DO NOT ACCESS
MODE REGISTER 1B (MR1B)
STATUS REGISTER B (SRB)
MODE REGISTER 1B (MR1B)
CLOCK-SELECT REGISTER B (CSRB)
COMMAND REGISTER B (CRB)
TRANSMITTER BUFFER B (TBB)
3
DO NOT ACCESS
RECEIVER BUFFER B (RBB)
3
3
DO NOT ACCESS
DO NOT ACCESS
INPUT PORT REGISTER (IP)
OUTPUT PORT CONTROL REGISTER (OPCR)
3
4
DO NOT ACCESS
OUTPUT PORT (OP) BIT SET
3
4
DO NOT ACCESS
OUTPUT PORT (OP) BIT RESET
MODE REGISTER 2A (MR2A)
MODE REGISTER 2B (MR2B)
MODE REGISTER 2A (MR2A)
MODE REGISTER 2B (MR2B)
NOTES:
1. S = Register permanently defined as supervisor-only access
2. S/U = Register programmable as either supervisor or user access
3. A read or write to these locations currently has no effect.
4. Address-triggered commands
Figure 7-9. Serial Module Programming Model
7.4.1.1 MODULE CONFIGURATION REGISTER (MCR). The MCR controls the serial
module configuration. This register can be either read or written when the module is
enabled and is in the supervisor state. The MCR is not affected by a CPU32 RESET
instruction. Only the MCR can be accessed when the module is disabled (i.e., the STP bit
in the MCR is set).
MCR
15
$700
14
13
12
11
0
10
0
9
0
8
0
7
6
0
5
0
4
0
3
0
2
1
0
STP
FRZ1
FRZ0
ICCS
SUPV
IARB
RESET:
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
Read/Write
Supervisor Only
MOTOROLA
MC68340 USER’S MANUAL
7- 19
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