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MC68340AB16E Datasheet, PDF (342/441 Pages) Motorola, Inc – Integrated Processor with DMA User’s Manual | |||
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Freescale Semiconductor, Inc.
The following steps are channel specific:
Clock Select Register (CSR)
⢠Select the receiver and transmitter clock.
Mode Register 1 (MR1)
⢠If desired, program operation of receiver ready-to-send (RxRTS bit).
⢠Select receiver-ready or FIFO-full notification (R/F bit).
⢠Select character or block error mode (ERR bit).
⢠Select parity mode and type (PM and PT bits).
⢠Select number of bits per character (B/Cx bits).
Mode Register 2 (MR2)
⢠Select the mode of channel operation (CMx bits).
⢠If desired, program operation of transmitter ready-to-send (TxRTS bit).
⢠If desired, program operation of clear-to-send (TxCTS bit).
⢠Select stop-bit length (SBx bits).
Command Register (CR)
⢠Enable the receiver and transmitter.
7.5.2 Serial Module Example Configuration Code
The following code is an example of a configuration sequence for the serial module.
***************************************************************************
* MC68340 basic serial module register initialization example code.
* This code is used to initialize the 68340's internal serial module registers,
* providing basic functions for operation.
* It sets up serial channel A for communication with a 9600 baud terminal.
* Note: All serial module registers must be accessed as bytes.
***************************************************************************
***************************************************************************
* equates
***************************************************************************
MBAR
EQU $0003FF00 Address of SIM40 Module Base Address Reg.
MODBASE EQU $FFFFF000 SIM40 MBAR address value
***************************************************************
* Serial module equates
SERIAL EQU $700
Offset from MBAR for serial module regs
MCRH
EQU $0
serial MCR high byte
MCRL
EQU $1
serial MCR low byte
MOTOROLA
MC68340 USERâS MANUAL
7-47
For More Information On This Product,
Go to: www.freescale.com
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