W79E825A/824A/823B/822B Data Sheet
Continued
BIT NAME
FUNCTION
3
2
1
0
-
Reserved.
Reserved.
-
Fosc1
Fosc0
CPU Oscillator Type Select bit 1
CPU Oscillator Type Select bit 0
Oscillator Configuration bits:
FOSC1
FOSC0
OSC SOURCE
4MHz ~ 20MHz crystal
Internal RC Oscillator
Reserved
0
0
1
1
0
1
0
1
External Oscillator in XTAL1
27.2 CONFIG2
CONFIG 2 :
7
6
0
5
4
3
2
1
-
-
-
-
-
C7
C6
-
CONFIG Bit
C7: 16K/8K/4K/2K Flash EPROM Code Lock Bit.
C6: 256/128 byte Data Lock Bit.
CONFIG Register 2
C7: 16K/8K/4K/2K Flash EPROM Lock bit
This bit is used to protect the customer's program code. It may be set after the programmer finishes
the programming and verifies sequence. Once this bit is set to logic 0, both the Flash EPROM data
and CONFIG Registers can not be accessed again.
C6: 256/128 byte Data Flash EPROM Lock bit
This bit is used to protect the customer's data code. It may be set after the programmer finishes the
programming and verifies sequence. Once this bit is set to logic 0, both the data Flash EPROM and
CONFIG Registers can not be accessed again.
- 116 -
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