AN2156 Freescale Semiconductor / Motorola, AN2156 Datasheet - Page 10

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

Application Note
10
ERASE — Erase Control Bit
PGM — Program Control Bit
Two FLASH block protect registers, FL1BPR and FL2BPR, are for
FLASH-1 and FLASH-2 arrays, respectively.
BPR[7:0] — Block Protect Register Bit 7 to Bit 0
Read:
Write:
This read/write bit configures the memory for erase operation.
ERASE is interlocked with the PGM bit such that both bits cannot be
set at the same time.
This read/write bit configures the memory for program operation.
PGM is interlocked with the ERASE bit such that both bits cannot be
set at the same time.
•
•
These eight bits specify the most significant bits of a 32-K FLASH
memory location. Memory is protected against program and erase
operations starting from this address to the end of the FLASH array.
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1 = Erase operation selected
0 = Erase operation unselected
1 = Program operation selected
0 = Program operation unselected
$FF80 — FLASH-1 block protect register (FL1BPR)
$FF81 — FLASH-2 block protect register (FL2BPR)
Figure 2. FLASH Block Protect Register (FLxBPR)
BPR7
Bit 7
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BPR6
6
BPR5
5
BPR4
4
BPR3
3
BPR2
2
BPR1
1
MOTOROLA
AN2156
BPR0
Bit 0