mpc89x54a Megawin Technology, mpc89x54a Datasheet - Page 29

• Manufacturer Part Number: mpc89x54a
• Description: 8-bit Micro-controller
• Manufacturer: Megawin Technology

time to finish.
Furthermore, it is a quite complex timing procedure to erase/program flash. Fortunately, the
MPC89x54A carried with convenient mechanism to help the user read/change the flash
content. Just filling the target address and data into several SFR, and triggering the built-in ISP
automation, the user can easily erase, read, and program the embedded flash and option
registers OR1.
There are several SFR designed to help the user implement the ISP functionality.
SFR: IFD (ISP Flash Data register):
SFR: IFADRH (ISP Flash Address High):
SFR: IFADRL (ISP Flash Address Low):
SFR: IFMT (ISP Flash Mode Table):
Note: OR0 cannot be changed by ISP operation. It can be accessed only by Writer. Only OR1 can be
IFD is the data port register for ISP operation. The data in IFD will be written into the desired address in
operating ISP write and it is the data window of readout in operating ISP read.
IFADRH is the high-byte address port for all ISP modes.
IFADRL is the low-byte address port for all ISP modes.
MEGAWIN
Bit-7
Bit-7
Bit-7
Bit-7
Mode Selection
changed by ISP program.
1
0
0
0
0
1
1
1
0
0
1
1
0
1
Bit-6
Bit-6
Bit-6
Bit-6
(Data to be written into flash, or data got from flash)
(High byte of the address pointing to flash memory)
(Low byte of the address pointing to flash memory)
0
1
0
1
1
0
1
reserved
Bit-5
Bit-5
Bit-5
Bit-5
Standby
AP-memory read
AP-memory/Data-flash program
AP-memory/Data-flash page erase
OR1 memory erase (IFADRL[0]=1).
OR1 memory read ( IFADRL[0] =1)
OR1 memory program ( IFADRL[0] = 1)
MPC89x54A Data Sheet
Bit-4
Bit-4
Bit-4
Bit-4
Bit-3
Bit-3
Bit-3
Bit-3
To Operate
Bit-2
Bit-2
Bit-2
Bit-2
Mode Selection
Bit-1
Bit-1
Bit-1
Bit-1
Bit-0
Bit-0
Bit-0
Bit-0
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