MC68340 datasheet(314/441 Pages) FREESCALE

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MOTOROLA

MC68340 USER’S MANUAL

7- 19

Address

700

MCR (HIGH BYTE)

701

MCR (LOW BYTE)

702

DO NOT ACCESS3

703

DO NOT ACCESS3

704

INTERRUPT LEVEL (ILR)

NTERRUPT LEVEL (ILR)

705

INTERRUPT VECTOR (IVR)

710

S/U2

MODE REGISTER 1A (MR1A)

711

S/U

STATUS REGISTER A (SRA)

CLOCK-SELECT REGISTER A (CSRA)

712

S/U

DO NOT ACCESS3

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 ACCESS3

717

S/U

DO NOT ACCESS3

718

S/U

MODE REGISTER 1B (MR1B)

719

S/U

STATUS REGISTER B (SRB)

CLOCK-SELECT REGISTER B (CSRB)

71A

S/U

DO NOT ACCESS3

COMMAND REGISTER B (CRB)

71B

S/U

RECEIVER BUFFER B (RBB)

TRANSMITTER BUFFER B (TBB)

71C

S/U

DO NOT ACCESS3

71D

S/U

INPUT PORT REGISTER (IP)

OUTPUT PORT CONTROL REGISTER (OPCR)

71E

S/U

DO NOT ACCESS3

OUTPUT PORT (OP)4 BIT SET

71F

S/U

DO NOT ACCESS3

OUTPUT PORT (OP)4 BIT RESET

720

S/U

MODE REGISTER 2A (MR2A)

721

S/U

MODE REGISTER 2B (MR2B)

NOTES:

S = Register permanently defined as supervisor-only access

S/U = Register programmable as either supervisor or user access

A read or write to these locations currently has no effect.

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

9876543210

STP

FRZ1

FRZ0

ICCS

000

SUPV

000

IARB

RESET:

000000010000000

Read/Write

Supervisor Only

Freescale Semiconductor, Inc.

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