參數(shù)資料
型號： MC68HC705E5P
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封裝： PLASTIC, DIP-28
文件頁數(shù)： 137/148頁
文件大小： 3554K
代理商： MC68HC705E5P
Motorola Bus (M Bus) Interface
Programming Considerations
MC68HC705E5 — Rev. 1.0
General Release Specification
Motorola Bus (M Bus) Interface
NON-DISCLOSURE
AGREEMENT
REQUIRED
11.8.2 Generation of a Start Signal and the First Byte of Data Transfer
After completion of the initialization procedure, serial data can be
transmitted by selecting the master transmitter mode. If the device is
connected to a multimaster bus system, the state of the M-bus busy bit
(MBB) must be tested to check whether the serial bus is free. If the bus
is free (MBB = 0), the start condition and the first byte (the slave address)
can be sent.
An example of a program which generates the start signal and transmits
the first byte of data (slave address) is shown here. (The MMUX bit must
be set to allow control of PB7 and PB6 pins.)
SEI
; DISABLE INTERRUPT
CHFALG
BRSET
5,MSR,CHFLAG; CHECK THE MBB BIT OF THE
; STATUS REGISTER. IF IT IS
; SET, WAIT UNTIL IT IS CLEAR
TXSTART
BSET
4,MCR
; SET TRANSMIT MODE
BSET
5,MCR
; SET MASTER MODE
; i.e., GENERATE START CONDITION
LDA
#CALLING
; GET THE CALLING ADDRESS
STA
MDR
; TRANSMIT THE CALLING
; ADDRESS
CLI
; ENABLE INTERRUPT
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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