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IC DESCRIPTION -1/1 (AN2136SC) -1/2
Pin No.
Pin Name
1
GND
2
CLK24
3 ~ 6
GND
7
AGND
8
XIN
9
XOUT
10
AVCC
11
VCC
12
GND
13
RESET
14
PC0/RXD0
15
PC1/TXD0
____
16
PC2/INT0
____
17
PC3/INT1
18
PC4/T0
19
PC5/T1
___
20
PC6/WR
___
21
PC7/RD
22
VCC
23
GND
I/O
–
Ground
O
24 MHz clock, phase locked to the 12 MHz input clock.
–
Ground
–
Analog ground. Connect to ground with as short a path as possible.
I
Connect this signal to a 12 MHz series resonant, fundamental mode crystal and 22-33 pF
O
capacitor to GND.
I
Analog VCC. This signal provides power to the analog circuit.
I
3.3V power source
–
Ground
I
Active high reset.
Multiplexed pin whose function is selected by the "RXD0" bit of the PORTCCFG register. If
I/O
RXD0=0, the pin is the bi-directional I/O port bit PC0. If RXD0 = 1 the pin is the active-high
RXD0 from 8051 UART0, which provides data to the UART in all modes.
Multiplexed pin whose function is selected by the "TXD0" bit of the PORTCCFG register. If
TXD0=0, the pin is the bi-directional I/O port bit PC1. If TXD0 = 1 the pin is the active-high
I/O
TXD0 signal for 8051 UART0, which provides the output clcok in sync mode, and the output
data in async mode.
Multiplexed pin whose function is selected by the "INT0" bit of the PORTCCFG register. If
I/O
INT0=0, the pin is the bi-directional I/O port bit PC2. If INT0 = 1 the pin is the active-low 8051
INT0 interrupt input signal, which is either edge triggered (IT0=1) or level triggered (IT0=0).
Multiplexed pin whose function is selected by the "INT1" bit of the PORTCCFG register. If
I/O
INT1=0, the pin is the bi-directional I/O port bit PC3. If INT1 = 1 the pin is the active-low 8051
INT1 interrupt input signal, which is either edge triggered (IT1=1) or level triggered (IT1=0).
Multiplexed pin whose function is selected by the "T0" bit of the PORTCCFG register. If T0=0,
the pin is the bi-directional I/O port bit PC4. If T0 = 1 the pin is the active-high T0 signal for
I/O
8051 Timer 0, which provides the input to Timer 0 when C/T0 is 1. When C/T0 is 0, Timer0
does not use this bit.
Multiplexed pin whose function is selected by the "T1" bit of the PORTCCFG register. If T1=0,
the pin is the bi-directional I/O port bit PC5. If T1 = 1 the pin is the active-high T1 signal from
I/O
8051 Timer 1, which provides the input to Timer 1 when C/T1 is 1. When C/T0 is 0, Timer1
does not use this bit.
Multiplexed pin whose function is selected by the "WR" bit of the PORTCCFG register. If
I/O
WR=0, the pin is the bi-directional I/O port bit PC6. If WR = 1 the pin is the active-low write
signal for external memory.
Multiplexed pin whose function is selected by the "RD" bit of the PORTCCFG register. If
I/O
RD=0, the pin is the bi-directional I/O port bit PC7. If RD = 1 the pin is the active-low read
signal for external memory.
I
3.3V power source
–
Ground
Description
-7-
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