AT80C51RA2 データシートの表示（PDF） - Atmel Corporation

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AT80C51RA2

High Performance 8-bit Microcontrollers

Atmel Corporation 

Bit

Bit Number Mnemonic Description

4

-

Reserved

The value read from this bit is indeterminate. Do not set this bit.

3

-

Reserved

The value read from this bit is indeterminate. Do not set this bit.

2

-

Reserved

The value read from this bit is indeterminate. Do not set this bit.

1

-

Reserved

The value read from this bit is indeterminate. Do not set this bit.

CPU and peripheral clock bit

0

X2

Clear to select 12 clock periods per machine cycle (STD mode, FOSC=FXTAL/2).

Set to select 6 clock periods per machine cycle (X2 mode, FOSC=FXTAL).

Reset Value = XXXX XXX0b

Not bit addressable

For further details on the X2 feature, please refer to ANM072 available on the web

(http://www.atmel.com)

14 AT/TS8xC51Rx2

4188F–8051–01/08

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