gc80c510 CORERIVER Semiconductor, gc80c510 Datasheet - Page 206

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

13.32 ALTSEL (E3h) : Alternative Function Selection Register
IORSTEN
Symbol
PWM00
Bit No.
IOXEN
TVO
CLO
TX
-
I/O bits from XTAL1/XTAL2 Enable. (XTAL1 : Input, XTAL2 : Output)
I/O bits from RESETB Enable.
System Clock Output Enable to P2[6].
PWM Waveform Output Enable to P0[0].
Timer0 Overflow Output Enable to P0[0].
UART TX Data Output Enable to P0[2]. (TXD : TX Data)
Reserved
R/W(0)
IOXEN
0 = The P1[1] and P1[0] bits are configured as XTAL Input/Output
1 = The P1[1] and P1[0] bits are configured as general I/O pins.
Note that you must set XTOFF bit (PMR.3) to “1” to turn off the internal amplifier.
0 = The P1[2] bit is configured as RESETB input.
1 = The P1[2] bit is configured as general I/O pin.
0 = Disable the System Clock Output to P2[6].
1 = Enable the System Clock Output to P2[6].
0 = Disable the PWM waveform output to P0[0].
1 = Enable the PWM waveform output to P0[0].
0 = Disable the Timer0 overflow output to P0[0].
1 = Enable the Timer0 overflow output to P0[0].
0 = Disable the TX data output to P0[2].
1 = Enable the TX data output to P0[2].
Note that the port directional mode (input/output) of P0[2] for TXD is don’t care.
But the directional mode (input/output) of P0[1] for RXD must set up to input mode,
When user is setting to UART communication.
7
IORSTEN
R/W(0)
6
R/W(0)
CLO
5
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PWM00
R/W(0)
4
Description
(Default)
R/W(0)
TVO
(Default)
3
(Default)
(Default)
(Default)
R/W(0)
Appendix B: SFR description
TX
2
(Default)
1
-
0
-