PIC12CE518 Datasheet, PDF(78/88 Page) Microchip Technology – 8-Pin, 8-Bit CMOS Microcontroller with EEPROM Data Memory

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PIC12CE518 Datasheet, PDF (78/88 Pages) Microchip Technology – 8-Pin, 8-Bit CMOS Microcontroller with EEPROM Data Memory

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PIC12CE5XX

;

; NOPs have been added to meet the timing specs for the memory at 4 MHz

; and low voltage. Applications running at slower clock rates and those

; operating within 4.5-5.5V may be able to remove some of the NOPs.

;

; This code is specifically written for the interface hardware of the

; 12CE51x parts. See AN571 for the unmodified routines.

;***************************************************************************

;*************************** EEPROM Subroutines **************************

;***************************************************************************

; Communication for EEPROM based on I2C protocol, with Acknowledge.

;

; Byte_Write: Byte write routine

;

Inputs: EEPROM Address

EEADDR

;

EEPROM Data

EEDATA

;

Outputs: Return 01 in W if OK, else return 00 in W

;

; Read_Current: Read EEPROM at address currently held by EE device.

;

Inputs: NONE

;

Outputs: EEPROM Data

EEDATA

;

Return 01 in W if OK, else return 00 in W

;

; Read_Random:

Read EEPROM byte at supplied address

;

Inputs: EEPROM Address

EEADDR

;

Outputs: EEPROM Data

EEDATA

;

Return 01 in W if OK, else return 00 in W

;

; Note: EEPROM subroutines will set bit 7 in PC_OFFSET register if the

;

EEPROM acknowledged OK, else that bit will be cleared. This bit

;

can be checked instead of refering to the value returned in W

;***************************************************************************

;

; OPERATION:

;

Byte Write:

;

load EEADDR and EEDATA

;

then CALL BYTE_WRITE

;

Read Random:

;

Load EEADDR

;

then CALL READ_RANDOM

;

data read returned in EEDATA

;

Read Current

;

no setup necessary

;

CALL READ_CURRENT

;

data read returned in EEDATA

;

;***************************************************************************

;

; These functions consume:

; 77 words Programming Memory

; 5 file registers which are overlayable. That is, they can share with

; other functions as long as they are mutually exclusive in time. See

; udata_ovr in the linker manual.

; 1 stack level (the call to the function itself. These functions do not

; call any lower level functions).

;

DS40172A-page 78

Preliminary

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