AN2156 Freescale Semiconductor / Motorola, AN2156 Datasheet - Page 24

• Manufacturer Part Number: AN2156
• Description: Programming and Erasing FLASH and EEPROM Memories on the MC68HC908AS60A/AZ60A
• Manufacturer: Freescale Semiconductor / Motorola

Application Note
EEPROM Control and Configuration Registers
24
Each EEPROM array has three registers that control its operation:
There are two EEPROM control registers, EE1CR and EE2CR, for
EEPROM-1 and EEPROM-2 arrays, respectively.
Bit 7 — Unused Bit
EEOFF — EEPROM Power-Down Bit
EERAS1 and EERAS0 — Erase Bits
Reset:
Read:
Write:
•
•
•
•
•
This read/write bit disables the EEPROM module for lower power
consumption. Any attempts to access the array will give unpredictable
results. Reset clears this bit.
These read/write bits set the erase modes. Reset clears these bits.
Freescale Semiconductor, Inc.
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1 = Disable EEPROM array
0 = Enable EEPROM array
EEPROM control register (EExCR)
EEPROM nonvolatile register (EExNVR)
EEPROM array configuration register (EExACR)
$FE1D — EEPROM-1 control register (EE1CR)
$FF7D — EEPROM-2 control register (EE2CR)
USED
Bit 7
UN
0
Figure 10. EEPROM Control Register (EExCR)
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= Unimplemented
6
0
0
EEOFF
5
0
EERAS1
4
0
EERAS0
3
0
EELAT
2
0
AUTO
1
0
MOTOROLA
EEPGM
AN2156
Bit 0
0