mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 58

• Manufacturer Part Number: mc68hc908jb8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

FLASH Memory
4.7 FLASH Program Operation
Technical Data
58
NOTE:
Programming of the FLASH memory is done on a row basis. A row
consists of 64 consecutive bytes starting from addresses $XX00,
$XX40, $XX80 or $XXC0. The procedure for programming a row of the
FLASH memory is outlined below:
This program sequence is repeated throughout the memory until all data
is programmed.
Programming and erasing of FLASH locations cannot be performed by
code being executed from the FLASH memory. While these operations
must be performed in the order shown, other unrelated operations may
occur between the steps. Do not exceed t
Memory
Figure 4-3
FLASH memory.
10. Wait for time, t
11. Clear the HVEN bit.
12. After time, t
1. Set the PGM bit. This configures the memory for program
2. Write any data to any FLASH address within the address range of
3. Wait for a time, t
4. Set the HVEN bit.
5. Wait for a time, t
6. Write data to the byte being programmed.
7. Wait for time, t
8. Repeat step 6 and 7 until all the bytes within the row are
9. Clear the PGM bit.
operation and enables the latching of address and data for
programming.
the row to be programmed.
programmed.
again.
Characteristics).
shows a flowchart representation for programming the
FLASH Memory
rcv
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
(1 s), the memory can be accessed in read mode
PROG
nvh
nvs
pgs
(5 s).
(5 s).
(10 s).
(20 s).
PROG
maximum (see
Freescale Semiconductor
18.13