MC68HC908RK2 Datasheet, PDF (30/158 Pages) Motorola, Inc – Microcontroller Unit

Memory
2.5.1 FLASH 2TS Control Register
The FLASH 2TS control register (FLCR) controls program, erase, and margin read operations.
Address:
Read:
Write:
Reset:
$FE08
Bit 7
0
0
6
5
FDIV0
BLK1
0
0
= Unimplemented
4
BLK0
0
3
2
1
Bit 0
HVEN MARGIN ERASE PGM
0
0
0
0
Figure 2-3. FLASH 2TS Control Register (FLCR)
FDIV0 — Frequency Divide Control Bit
This read/write bit selects the factor by which the charge pump clock is divided from the system clock.
See 2.5.2 FLASH 2TS Charge Pump Frequency Control.
BLK1 — Block Erase Control Bit
This read/write bit together with BLK0 allows erasing of blocks of varying size. See 2.5.3 FLASH 2TS
Erase Operation for a description of available block sizes.
BLK0 — Block Erase Control Bit
This read/write bit together with BLK1 allows erasing of blocks of varying size. See 2.5.3 FLASH 2TS
Erase Operation for a description of available block sizes.
HVEN — High-Voltage Enable Bit
This read/write bit enables the charge pump to drive high voltages for program and erase operations
in the array. HVEN can be set only if either PGM = 1 or ERASE = 1 and the proper sequence for smart
programming or erase is followed.
1 = High voltage enabled to array and charge pump on
0 = High voltage disabled to array and charge pump off
MARGIN — Margin Read Control Bit
This read/write bit configures the memory for margin read operation. MARGIN cannot be set if the
HVEN = 1. MARGIN will automatically return to unset (0) if asserted when HVEN = 1.
1 = Margin read operation selected
0 = Margin read operation unselected
ERASE — Erase Control Bit
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.
1 = Erase operation selected
0 = Erase operation unselected
PGM — Program Control Bit
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.
1 = Program operation selected
0 = Program operation unselected
MC68HC908RK2 Data Sheet, Rev. 5.1
30
Freescale Semiconductor