gc80c510 CORERIVER Semiconductor, gc80c510 Datasheet - Page 191

• Manufacturer Part Number: gc80c510
• Description: Eprom/rom 8-bit Turbo Microcontrollers
• Manufacturer: CORERIVER Semiconductor

13.12 P1 (90h) : Port 1 Register
MiDAS1.1 Family
several other SFRs
[About the alternative pins and description]
In addition, all the pins have an alternative function listed below. Each of the functions is controlled by
Alternative Pin
This register functions as a general purpose I/O port. The initial value of P0 is FFh.
Bit No.
Port 1
RESETB
XTAL1
XTAL2
7
-
-
External Crystal Oscillator Input. (Refer to ALTSEL)
External Crystal Oscillator Output. (Refer to ALTSEL)
Inverted Reset Input. Active Low. (Refer to ALTSEL)
6
-
-
5
-
-
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4
-
-
Description
3
-
-
RESETB
R/W(1)
P1[2]
P0.2
2
R/W(1)
XTAL2
P1[1]
P0.1
1
R/W(1)
XTAL1
P1[0]
P0.0
0