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MPC89x53AF Datasheet(PDF) 29 Page - Megawin Technology Co., Ltd

Part # MPC89x53AF
Description  8-bit micro-controller
PDF  38 Pages
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Manufacturer  MEGAWIN [Megawin Technology Co., Ltd]
Direct Link  http://www.megawin.com.tw/megawin_EN/Index.asp
Logo MEGAWIN - Megawin Technology Co., Ltd

MPC89x53AF Datasheet(HTML) 29 Page - Megawin Technology Co., Ltd

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SFR: SCMD (Sequential Command Data register for ISP) :
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
ISP-Command (Device ID)
SCMD is the command port for triggering ISP activity. If SCMD is filled with sequential 46h, B9h and if
ISPCR.7 = 1, ISP activity will be triggered.
When this register is read, the device ID of MPC89x53A will be returned (2 bytes). The MSB byte of DID
is F0h and LSB byte 04h. IFADRL[0] is used to select HIGH/LOW byte of DID.
SFR: ISPCR (ISP Control register):
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
ISPEN
SWBS
SWRST
-
-
WAIT
ISPEN: ISP function enabling bit
0: = Disable ISP program to change flash
1: = Enable ISP program to change flash
SWBS: Secondary Booting program selecting
0: = Boot from main-memory.
1: = Boot from ISP memory.
SWRST: software reset trigger
0: = No operation
1: = Generate software system reset.
It will be cleared by hardware automatically.
Notice: Software reset actions could reset other SFR, but it never influences bits ISPEN and
SWBS. The ISPEN and SWBS only will be reset by power-up action, not software reset.
WAIT: Waiting time selection while the flash is busy.
CPU Wait time (Machine Cycle)
ISPCR[2:0]
Page Erase
Program
Read
Recommended
System clock
0 0 0
43769
240
43
40M
0 0 1
21885
120
22
20M
0 1 0
10942
60
11
10M
0 1 1
5471
30
6
5M
Procedures demonstrating ISP function
IFMT ← xxxxx011 b
/* choice page-erasing command */
ISPCR ← 100xx010b
/* set ISPEN=1 to enable flash change.
set WAIT=010, 10942 MC; assumed 10M X’s*/
IFADRH ← (page address high byte)
/* specify the address of the page to be erased */
IFADRL ← (page address low byte)
SCMD ← 46h
/* trig ISP activity */
SCMD ← B9h
(CPU progressing will be hold here )
(CPU continues)
Erase a specific flash page
MEGAWIN
MPC89x53A Data Sheet
29



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