P87C554 NXP Semiconductors, P87C554 Datasheet - Page 14

• Manufacturer Part Number: P87C554
• Description: The P87C554 Single-Chip 8-Bit Microcontroller is manufactured inan advanced CMOS process and is a derivative of the 80C51microcontroller family
• Manufacturer: NXP Semiconductors

Philips Semiconductors
2002 Mar 25
80C51 8-bit microcontroller – 12 clock operation
16K/512 OTP/RAM, 8 channel 10-bit A/D, I
capture/compare, high I/O
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.
AUXR1
Symbol
DPS
WUPD
GF2
SRST
AIDL
ADC8
Address = A2H
Not Bit Addressable
Bit:
Function
Data Pointer Switch—switches between DPRT0 and DPTR1.
DPS
0
1
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
ADC8
7
Operating Mode
DPTR0
DPTR1
Operating Mode
10-bit conversion (50 machine cycles)
8-bit conversion (24 machine cycles)
AIDL
6
SRST
Figure 7. AUXR1: DPTR Control Register
5
GF2
2
4
C, PWM,
WUPD
12
3
0
2
—
1
DSP
0
Reset Value = 0000 00x0B
P87C554
Product data
SU01081