80C54X2 데이터 시트보기 (PDF) - Temic Semiconductors

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80C54X2

8-bit CMOS Microcontroller 0-60 MHz

Temic Semiconductors 

CKCON - Clock Control Register (8Fh)

7

6

5

-

-

-

Table 4. CKCON Register

4

3

-

-

TS80C54X2/C58X2

TS87C54X2/C58X2

2

1

0

-

-

X2

Bit

Bit

Number Mnemonic

Description

7

-

Reserved

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

6

-

Reserved

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

5

-

Reserved

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

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.temic-semi.com)

Rev. B - Aug. 31, 1999

9

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