MC68HC908AS60ACFN FREESCALE [Freescale Semiconductor, Inc], MC68HC908AS60ACFN Datasheet - Page 62

• Manufacturer Part Number: MC68HC908AS60ACFN
• Description: M68HC08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

FLASH-2 Memory
5.3 FLASH-2 Control and Block Protect Registers
The FLASH-2 array has two registers that control its operation, the FLASH-2 Control Register (FL2CR)
and the FLASH-2 Block Protect Register (FL2BPR).
5.3.1 FLASH-2 Control Register
The FLASH-2 Control Register (FL2CR) controls FLASH-2 program and erase operations.
HVEN — High-Voltage Enable Bit
MASS — Mass Erase Control Bit
ERASE — Erase Control Bit
PGM — Program Control Bit
5.3.2 FLASH-2 Block Protect Register
The FLASH-2 Block Protect Register (FL2BPR) is implemented as a byte within the FLASH-1 memory
and therefore can only be written during a FLASH programming sequence. The value in this register
determines the starting location of the protected range within the FLASH-2 memory.
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This read/write bit enables the charge pump to drive high voltages for program and erase operations
in the array. HVEN can only be set if either PGM = 1 or ERASE = 1 and the proper sequence for
program or erase is followed.
Setting this read/write bit configures the FLASH-2 array for mass or page erase operation.
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 equal to 1 or set to 1 at the same time.
1 = High voltage enabled to array and charge pump on
0 = High voltage disabled to array and charge pump off
1 = Mass erase operation selected
0 = Page erase operation selected
1 = Erase operation selected
0 = Erase operation unselected
1 = Program operation selected
0 = Program operation unselected
Address:
Reset:
Read:
Write:
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
$FE08
Bit 7
0
0
Figure 5-1. FLASH-2 Control Register (FL2CR)
= Unimplemented
6
0
0
5
0
0
4
0
0
HVEN
3
0
MASS
2
0
ERASE
1
0
Freescale Semiconductor
PGM
Bit 0
0