P87C554 查看數據表（PDF） - Philips Electronics

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P87C554

80C51 8-bit microcontroller 16K/512 OTP/RAM 8 channel 10-bit A/D, I2C, PWM, capture/compare, high I/O

Philips Electronics 

Philips Semiconductors

80C51 8-bit microcontroller

16K/512 OTP/RAM, 8 channel 10-bit A/D, I2C, PWM,

capture/compare, high I/O

Product data

P87C554

AUXR1

Address = A2H

Not Bit Addressable

Symbol

DPS

WUPD

GF2

SRST

AIDL

ADC8

ADC8 AIDL SRST

GF2 WUPD

0

—

Bit:

7

6

5

4

3

2

1

Function

Data Pointer Switch—switches between DPRT0 and DPTR1.

DPS

0

1

Operating Mode

DPTR0

DPTR1

Enable wakeup from powerdown.

General Purpose Flag—set and cleared by the user.

Software Reset

Enables the ADC during idle mode.

ADC Mode Switch—switches between 10-bit conversion and 8-bit conversion.

ADC8

0

1

Operating Mode

10-bit conversion (50 machine cycles)

8-bit conversion (24 machine cycles)

Reset Value = 0000 00x0B

DSP

0

NOTE:

*User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that

case, the reset or inactive value of the new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate.

Figure 7. AUXR1: DPTR Control Register

SU01081

2002 Mar 25

12

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