參數(shù)資料
型號(hào): AN1241D
廠商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: Interfacing the MC68HC705J1A to 9356/9366 EEPROMs
中文描述: 接口的MC68HC705J1A的九千三百六十六分之九千三百五十六的EEPROM
文件頁(yè)數(shù): 11/21頁(yè)
文件大?。?/td> 253K
代理商: AN1241D
AN1241/D
11
*****************************************************************************
*
* *
* Equates and RAM Storage *
* *
*****************************************************************************
*
CS equ 0 ;bit # for chip select
SER_CLK equ 1 ;bit # for serial clock
SER_OUT equ 2 ;bit # for serial data out
SER_IN equ 3 ;bit # for serial data in
*** RAM storage variables ***
org RAM ;start of static RAM at $C0
OPCODE rmb 1 ;command byte
ADDR rmb 1 ;EEPROM address byte
DATA_H rmb 1 ;MSByte of data
DATA_L rmb 1 ;LSByte of data
TEST1 rmb 1 ;test byte #1
TEST2 rmb 1 ;test byte #2
TEST3 rmb 1 ;test byte #3
TEST4 rmb 1 ;test byte #4
*****************************************************************************
*
* *
* Program Initialization *
* *
* This section sets up the port for bit banging. *
* *
* To prevent floating inputs and associated high current draw, *
* the HC705J1A has pulldown devices on all I/O pins. This *
* initialization should enable these pulldowns on unused I/O *
* pins. RESET_ enables the pulldowns, so no code is required. *
* *
*****************************************************************************
*
org EPROM
J9356_START lda #$80 ;init portA
sta PORTA ;
sta COPR ;kick the wdog
lda #$87 ;init i/o of port A
sta DDRA
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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