W79E825A Datasheet, PDF (115/127 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E825A/824A/823B/822B Data Sheet
27 CONFIG BITS
The W79E825 series have two CONFIG bits (CONFIG1, CONFIG2) that must be define at power up
and can not be set after the program start of execution. Those features are configured through the use
of two flash EPROM bytes, and the flash EPROM can be programmed and verified repeatedly. Until
the code inside the Flash EPROM is confirmed OK, the code can be protected. The protection of flash
EPROM (CONFIG2) and those operations on it are described below. The data of these bytes may be
read by the MOVC instruction at the addresses.
27.1 CONFIG1
BIT NAME
7
-
6 RPD
5 PRHI
4 BOV
FUNCTION
Reserved.
Reset Pin Disable bit:
0: Enable Reset function of Pin 1.5.
1: Disable Reset function of Pin 1.5, and it to be used as an input port pin.
Port Reset High or Low bit:
0: Port reset to low state.
1: Port reset to high state.
Brownout Voltage Select bit:
0: Brownout detect voltage is 3.8V.
1: Brownout detect voltage is 2.5V.
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Publication Release Date: February 21, 2008
Revision A9