XA-G49 Datasheet, PDF (18/42 Pages) NXP Semiconductors – XA 16-bit microcontroller family 64K FLASH/2K RAM, watchdog, 2 UARTs

Philips Semiconductors
XA 16-bit microcontroller family
64K Flash/2K RAM, watchdog, 2 UARTs
Preliminary specification
XA-G49
API CALL
ERASE SPECIAL CELL
READ SPECIAL CELL
PARAMETER
Input Parameters:
R0H = 95h
R6 = special cell address
0000h: erase BPSW[7:0]
0001h: erase BPSW[15:8]
0002h: erase BPC[7:0]
0003h: erase BPC[15:8]
0004h: erase status byte
Return Parameters:
R4L = 00 if pass, non–zero if fail
Input Parameters:
R0H = 96h
R6 = special cell address
0000h: read BPSW[7:0]
0001h: read BPSW[15:8]
0002h: read BPC[7:0]
0003h: read BPC[15:8]
0004h: read status byte
0006h: read manufacturer ID
0007h: read device ID #1
0008h: read device ID #2
000Ah: read security bit #1
000Ch: read security bit #2
000Eh: read security bit #3
Return Parameters:
R4L = value of byte read
Security
The security feature protects against software piracy and prevents the contents of the Flash from being read. The Security Lock bits are located
in Flash. The XA-G49 has 3 programmable security lock bits that will provide different levels of protection for the on-chip code and data (see
Table 4).
Table 4.
SECURITY LOCK BITS¹
Level
SB1
SB2
SB3
PROTECTION DESCRIPTION
1
0
0
0
No program security features enabled.
2
1
0
0
Inhibit writing to Flash. Also, MOVC instructions executed from external program memory
are disabled from fetching code bytes from internal memory.
3
1
1
0
Same as level 2, plus program verification is disabled
4
1
1
1
Same as level 3, plus external execution is disabled.
NOTE:
1. Any other combination of the Lock bits is not defined.
2000 Apr 03
18