P89C668 datasheet(20/54 Pages) PHILIPS

Part #	P89C668

Description	80C51 8-bit Flash microcontroller family 64KB ISP FLASH with 8KB RAM

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Manufacturer	PHILIPS [NXP Semiconductors]

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Philips Semiconductors

Preliminary data

P89C668

80C51 8-bit Flash microcontroller family

64KB ISP Flash with 8KB RAM

2001 Jul 27

20

PX0

IP (0B8H)

Priority Bit = 1 assigns high priority

Priority Bit = 0 assigns low priority

BIT

SYMBOL

FUNCTION

IP.7

PT2

Timer 2 interrupt priority bit.

IP.6

PPC

PCA interrupt priority bit

IP.5

PS1

Serial I/O1 (I2C) interrupt priority bit.

IP.4

PS0

Serial Port interrupt priority bit.

IP.3

PT1

Timer 1 interrupt priority bit.

IP.2

PX1

External interrupt 1 priority bit.

IP.1

PT0

Timer 0 interrupt priority bit.

IP.0

PX0

External interrupt 0 priority bit.

SU01461

PT0

PX1

PT1

PS0

PS1

PPC

PT2

0

1

2

3

4

5

6

7

Figure 11. IP Registers

PX0H

IPH (B7H)

Priority Bit = 1 assigns higher priority

Priority Bit = 0 assigns lower priority

BIT

SYMBOL

FUNCTION

IPH.7

PT2H

Timer 2 interrupt priority bit high.

IPH.6

PPCH

PCA interrupt priority bit

IPH.5

PS1H

Serial I/O (I2C) interrupt priority bit high.

IPH.4

PS0H

Serial Port interrupt priority bit high.

IPH.3

PT1H

Timer 1 interrupt priority bit high.

IPH.2

PX1H

External interrupt 1 priority bit high.

IPH.1

PT0H

Timer 0 interrupt priority bit high.

IPH.0

PX0H

External interrupt 0 priority bit high.

SU01462

PT0H

PX1H

PT1H

PS0H

PS1H

PPCH

PT2H

0

1

2

3

4

5

6

7

Figure 12. IPH Registers

ET2

IEN1 (E8H)

Priority Bit = 1 assigns higher priority

Priority Bit = 0 assigns lower priority

BIT

SYMBOL

FUNCTION

IEN1.7

—

IEN1.6

—

IEN1.5

—

IEN1.4

—

IEN1.3

—

IEN1.2

—

IEN1.1

—

IEN1.0

ET2

Timer 2 interrupt enable bit.

SU01095

—

0

1

2

3

4

5

6

7

Figure 13. IEN1 Registers

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