s908gz60cfa Freescale Semiconductor, Inc, s908gz60cfa Datasheet - Page 53

• Manufacturer Part Number: s908gz60cfa
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Programming tools are available from Freescale. Contact your local Freescale representative for more
information.
2.7.2 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).
2.7.2.1 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
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the FLASH difficult for
Freescale Semiconductor
unauthorized users.
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:
MC68HC908GZ60 • MC68HC908GZ48 • MC68HC908GZ32 Data Sheet, Rev. 6
A security feature prevents viewing of the FLASH contents.
$FE08
Bit 7
0
0
Figure 2-7. FLASH-2 Control Register (FL2CR)
= Unimplemented
6
0
0
5
0
0
NOTE
4
0
0
HVEN
3
0
MASS
2
0
ERASE
1
0
FLASH-2 Memory (FLASH-2)
(1)
PGM
Bit 0
0
53