Philips 8-bit microcontroller with two-clock 80C51 core UM10109 Manual Do Utilizador
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
User manual
Rev. 02 — 23 May 2005
124 of 133
Philips Semiconductors
UM10109
P89LPC932A1 User manual
18.18 User security bytes
This device has three security bits associated with each of its eight sectors, as shown in
4
WDSE
Watchdog Safety Enable bit. Refer to
for details.
5
BOE
Brownout Detect Enable (see
6
RPE
Reset pin enable. When set = 1, enables the reset function of pin P1.5. When cleared, P1.5 may be used as
an input pin. NOTE: During a power-up sequence, the RPE selection is overridden and this pin will always
functions as a reset input. After power-up the pin will function as defined by the RPE bit. Only a power-up
reset will temporarily override the selection defined by RPE bit. Other sources of reset will not override the
RPE bit.
an input pin. NOTE: During a power-up sequence, the RPE selection is overridden and this pin will always
functions as a reset input. After power-up the pin will function as defined by the RPE bit. Only a power-up
reset will temporarily override the selection defined by RPE bit. Other sources of reset will not override the
RPE bit.
7
WDTE
Watchdog timer reset enable. When set = 1, enables the watchdog timer reset. When cleared = 0, disables
the watchdog timer reset. The timer may still be used to generate an interrupt. Refer to
the watchdog timer reset. The timer may still be used to generate an interrupt. Refer to
for details.
Table 101: Flash User Configuration Byte (UCFG1) bit description
…continued
Bit Symbol
Description
Table 102: Oscillator type selection
FOSC[2:0] Oscillator configuration
111
External clock input on XTAL1.
100
Watchdog Oscillator, 400 kHz (+20/
−30 % tolerance).
011
Internal RC oscillator, 7.373 MHz ± 2.5 %.
010
Low frequency crystal, 20 kHz to 100 kHz.
001
Medium frequency crystal or resonator, 100 kHz to 4 MHz.
000
High frequency crystal or resonator, 4 MHz to 12 MHz.
Table 103: Sector Security Bytes (SECx) bit allocation
Bit
7
6
5
4
3
2
1
0
Symbol
-
-
-
-
-
EDISx
SPEDISx
MOVCDISx
Unprogrammed
value
value
0
0
0
0
0
0
0
0
Table 104: Sector Security Bytes (SECx) bit description
Bit Symbol
Description
0
MOVCDISx
MOVC Disable. Disables the MOVC command for sector x. Any MOVC that attempts to read a byte in a
MOVC protected sector will return invalid data. This bit can only be erased when sector x is erased.
MOVC protected sector will return invalid data. This bit can only be erased when sector x is erased.
1
SPEDISx
Sector Program Erase Disable x. Disables program or erase of all or part of sector x. This bit and sector
x are erased by either a sector erase command (ISP, IAP, commercial programmer) or a 'global' erase
command (commercial programmer).
x are erased by either a sector erase command (ISP, IAP, commercial programmer) or a 'global' erase
command (commercial programmer).
2
EDISx
Erase Disable ISP. Disables the ability to perform an erase of sector x in ISP or IAP mode. When
programmed, this bit and sector x can only be erased by a 'global' erase command using a commercial
programmer. This bit and sector x CANNOT be erased in ISP or IAP modes.
programmed, this bit and sector x can only be erased by a 'global' erase command using a commercial
programmer. This bit and sector x CANNOT be erased in ISP or IAP modes.
3:7 -
reserved