Typewriter User Manual

MOTOROLA MC68340 USER’S MANUAL 7- 19
Address FC Register Read (R/W = 1) Register Write (R/W = 0)
700 S
1
MCR (HIGH BYTE) MCR (HIGH BYTE)
701 S MCR (LOW BYTE) MCR (LOW BYTE)
702 S DO NOT ACCESS
3
DO NOT ACCESS
3
703 S DO NOT ACCESS
3
DO NOT ACCESS
3
704 S INTERRUPT LEVEL (ILR) NTERRUPT LEVEL (ILR)
705 S INTERRUPT VECTOR (IVR) INTERRUPT VECTOR (IVR)
710 S/U
2
MODE REGISTER 1A (MR1A) MODE REGISTER 1A (MR1A)
711 S/U STATUS REGISTER A (SRA) CLOCK-SELECT REGISTER A (CSRA)
712 S/U DO NOT ACCESS
3
COMMAND REGISTER A (CRA)
713 S/U RECEIVER BUFFER A (RBA) TRANSMITTER BUFFER A (TBA)
714 S/U INPUT PORT CHANGE REGISTER (IPCR) AUXILIARY CONTROL REGISTER (ACR)
715 S/U INTERRUPT STATUS REGISTER (ISR) INTERRUPT ENABLE REGISTER (IER)
716 S/U DO NOT ACCESS
3
DO NOT ACCESS
3
717 S/U DO NOT ACCESS
3
DO NOT ACCESS
3
718 S/U MODE REGISTER 1B (MR1B) MODE REGISTER 1B (MR1B)
719 S/U STATUS REGISTER B (SRB) CLOCK-SELECT REGISTER B (CSRB)
71A S/U DO NOT ACCESS
3
COMMAND REGISTER B (CRB)
71B S/U RECEIVER BUFFER B (RBB) TRANSMITTER BUFFER B (TBB)
71C S/U DO NOT ACCESS
3
DO NOT ACCESS
3
71D S/U INPUT PORT REGISTER (IP) OUTPUT PORT CONTROL REGISTER (OPCR)
71E S/U DO NOT ACCESS
3
OUTPUT PORT (OP)
4
BIT SET
71F S/U DO NOT ACCESS
3
OUTPUT PORT (OP)
4
BIT RESET
720 S/U MODE REGISTER 2A (MR2A) MODE REGISTER 2A (MR2A)
721 S/U MODE REGISTER 2B (MR2B) 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 $700
1514131211109876543210
STP FRZ1 FRZ0 ICCS 0
000
SUPV
000
IARB
RESET:
0
000000010000000
Read/Write Supervisor Only
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
nc...