ETIC 2230 Betriebsanweisung PDF herunterladen (Seite 30)

Rev. 1.10 30 November 14, 2014 Rev. 1.10 31 November 14, 2014

HT66FW2230

Wireless Charger A/D Flash 8-Bit MCU

Programming Considerations

CaremustbetakenthatdataisnotinadvertentlywrittentotheEEPROM.Protectioncanbe

PeriodicbyensuringthattheWriteEnablebitisnormallyclearedtozerowhennotwriting.Also

theMemoryPointercouldbenormallyclearedtozeroasthiswouldinhibitaccesstoBank1where

theEEPROMcontrolregisterexist.Althoughcertainlynotnecessary,considerationmightbegiven

intheapplicationprogramtothecheckingofthevalidityofnewwritedatabyasimplereadback

process.WhenwritingdatatheWRbitmustbesethighimmediatelyaftertheWRENbithasbeen

sethigh,toensurethewritecycleexecutescorrectly.TheglobalinterruptbitEMIshouldalsobe

clearedbeforeawritecycleisexecutedandthenre-enabledafterthewritecyclestarts.Notethat

thedeviceshouldnotentertheIDLEorSLEEPmodeuntiltheEEPROMreadorwriteoperationis

totallycomplete.Otherwise,theEEPROMreadorwriteoperationwillfail.

Programming Examples

• Reading data from the EEPROM – polling method

MOV A, EEPROM_ADRES ; user dened address

MOV EEA, A

MOV A, 040H ; setup memory pointer MP1

MOV MP1L, A ; MP1L points to EEC register

MOV A, 01H ; setup Memory Pointer

MOV MP1H, A

SET IAR1.1 ; set RDEN bit, enable read operations

SET IAR1.0 ; start Read Cycle - set RD bit

BACK:

SZ IAR1.0 ; check for read cycle end

JMP BACK

CLR IAR1 ; disable EEPROM read/write

CLR MP1H

MOV A, EED ; move read data to register

MOV READ_DATA, A

• Writing Data to the EEPROM – polling method

MOV A, EEPROM_ADRES ; user dened address

MOV EEA, A

MOV A, EEPROM_DATA ; user dened data

MOV EED, A

MOV A, 040H ; setup memory pointer MP1

MOV MP1L, A ; MP1L points to EEC register

MOV A, 01H ; setup Memory Pointer

MOV MP1H, A

CLR EMI

SET IAR1.3 ; set WREN bit, enable write operations

SET IAR1.2 ; start Write Cycle - set WR bit

SET EMI

BACK:

SZ IAR1.2 ; check for write cycle end

JMP BACK

CLR IAR1 ; disable EEPROM write

CLR MP1H

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