Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller
8K/256 OTP, 8 channel 10 bit A/D, I
2
C, PWM,
capture/compare, high I/O, low voltage (2.7V–5.5V), low power
P87C552
AUXR1
Address = A2H
Not Bit Addressable
ADC8
Bit:
7
AIDL
6
SRST
5
GF2
4
WUPD
3
0
2
—
1
DSP
0
Reset Value = 0000 00x0B
Symbol
DPS
Function
Data Pointer Switch—switches between DPRT0 and DPTR1.
DPS
Operating Mode
0
DPTR0
1
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)
WUPD
GF2
SRST
AIDL
ADC8
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.
SU01081
Figure 6. AUXR1: DPTR Control Register
1999 Mar 30
12
PHILIPS [ NXP SEMICONDUCTORS ]
