參數(shù)資料
型號(hào): MC68HC705L16
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述: 8位微控制器單元(MCU)。(8位微控制器)
文件頁數(shù): 23/28頁
文件大?。?/td> 139K
代理商: MC68HC705L16
Application Note
Code Listings
AN1763
MOTOROLA
23
************************************************************************************
* Convert ASCII character byte in A to an offset value into
* the table of LCD segment values.
* The software also checks for an invalid or unusable ASCII
* character value, and shows a blank space in its place.
* Valid ASCII values are (decimal): 32-47, 48-57, 65-90
************************************************************************************
ASC2Offset
CMP
#!48
BLO
Special
CMP
#!65
BLO
Numeric
Alpha
CMP
#!90
BHI
ConvError
SUB
#!39
BRA
ConvDone
Special
CMP
#!32
BLO
ConvError
SUB
#!32
BRA
ConvDone
Numeric
CMP
#!57
BHI
ConvError
SUB
#!32
BRA
ConvDone
ConvError
CLRA
ConvDone
ROLA
RTS
************************************************************************************
* BlankSpace shows a space ($0000) at the current display position's
* LCD data registers.
************************************************************************************
BlankSpace
LDX
LCDReg
CLR
0,X
CLR
1,X
INC
LCDReg
INC
LCDReg
RTS
;Check for "special" character
;Check for numeric character
;Check for invalid value
;Convert to table offset
;Check for invalid value
;Convert to table offset
;Check for invalid value
;Convert to table offset
;Invalid value shows as blank space
;Multiply offset by 2
;(2 bytes data per LCD position)
;Point to current LCD data register
;Clear first data byte
;Clear second data byte
;Increment LCDreg pointer to
;point to the next position's regs.
;Return
************************************************************************************
* Delay for number of quarterseconds = QTRSEC
************************************************************************************
LongDelay
CLRX
Delayloop
LDA
#!250
JSR
Delay
INCX
TXA
CMP
#QTRSECS
BEQ
Finish
BRA
Delayloop
Finish
RTS
;
;Load accumulator with #ms to delay
;Jump to #ms delay subroutine
;
;
;
;
;Return
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