XA-G39 Datasheet, PDF (18/42 Pages) NXP Semiconductors – XA 16-bit microcontroller family XA 16-bit microcontroller 32K FLASH/1K RAM, watchdog, 2 UARTs

Philips Semiconductors
XA 16-bit microcontroller family
32K Flash/1K RAM, watchdog, 2 UARTs
Preliminary data
XA-G39
IAP 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-G39 has 3 programmable security lock bits that will provide different levels of protection for the on-chip code and data (see
Table 3).
Table 3.
SECURITY LOCK BITS¹
Level
SB1
SB2
SB3
PROTECTION DESCRIPTION
1
0
0
0
No program security features enabled.
2
1
0
0
Same as level 1, plus block erase is disabled. Erase or programming of the status byte or
boot vector is disabled.
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.
2. Security bits are independent of each other. Full-chip erase may be performed regardless of the states of the security bits.
3. Setting LB doesn’t prevent programming of unprogrammed bits.
2002 Mar 13
18