EM78F651NAMSSLASHNAMJ datasheet(37/58 Pages) EMC

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EM78F651N

8-Bit Microcontroller

Product Specification (V1.1) 10.20.2006

• 33

(This specification is subject to change without further notice)

Bit 5

：EEPROM Write Enable bit

0 : Prohibit write to the EEPROM

1 : Allows EEPROM write cycles.

Bit 4

：EEPROM Detect Flag

0 : Write cycle is completed

1 : Write cycle is unfinished

Bit 3

：EEPROM power-down control bit

0 : Switch off the EEPROM

1 : EEPROM is operating

Bits 2 ~ 0: Not used, set to “0” at all time

6.8.1.2 RC (128 Bytes EEPROM Address)

When accessing the EEPROM data memory, the RC (128 bytes EEPROM address

bytes EEPROM Data register) holds the data to written, or the data read, at the

address in RC.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

EE_A6

EE_A5

EE_A4

EE_A3

EE_A2

EE_A1

EE_A0

Bit 7

： Not used, fixed at “0”.

Bits 6 ~ 0

： 128 bytes EEPROM address

6.8.1.3 RD (128 Bytes EEPROM Data)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

EE_D7

EE_D6

EE_D5

EE_D4

EE_D3

EE_D2

EE_D1

EE_D0

Bits 7 ~ 0

： 128 bytes EEPROM data

6.8.2 Programming Step / Example Demonstration

6.8.2.1 Programming Step

Follow these steps to write or read data from the EEPROM:

(1) Set the RC.EEPC bit to 1 for enable EEPROM power.

(2) Write the address to RC (128 bytes EEPROM address).

a.1. Set the RC.EEWE bit to 1, if the write function is employed.

a.2. Write the 8-bit data value to be programmed in the RD (128 bytes EEPROM

data)

a.3. Set the RC.WR bit to 1, then execute write function

Set the RC.READ bit to 1, after which, execute read function

(3) a.

Wait for the RC.EEDF or RC.WR to be cleared

Wait for the RC.EEDF to be cleared

(4) For the next conversion, go to Step 2 as required.

(5) If user wants to save power and to make sure the EEPROM data is not used,

clear the RC.EEPC.

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