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10. Ports (INPUT, I/O PORT)
10.1
Overview
The ML63611 has built in it a 4-bit input-only port (Port 0) and 8-bit I/O ports (Port A, Port B, Port C, and Port
E).
Port 0 has the three modes of input with pull-up resistor, input with pull-down resistor, and high impedance, one
of which can be selected by software. Further, there are the functions of external 5 interrupt and of transfer to
system reset due to simultaneous key depression.
The pairs Port A and Port B, and Port C and Port E have the input modes of input with pull-up resistor, input with
pull-down resistor, and high impedance, or the output modes of P-channel open drain output, N-channel open
drain output, CMOS output, and high impedance, and in each case, one of the modes can be selected by software.
In addition, Port B has the external 0 interrupt function and Port C has the external 1 interrupt function.
Port E has the function of RC oscillator clock output for an A/D converter, the low-speed oscillation clock output
function, the high-speed oscillation clock output function, and the external 2 interrupt function.
10.2
Ports List
The ports of the ML63611 are shown in Table 10-1.
Port
I/O
Basic function:
Port 0
I
Secondary function: External 5 interrupt (4-bit OR input)
Basic function:
Port A
I/O
Secondary function: None
Basic function:
Port B
I/O
Secondary function: External 0 interrupt (4-bit OR input)
Basic function:
Secondary function: Serial port receive data input pin (PC.0/RXD)
Port C
I/O
Basic function:
Secondary function: Output pin of RC oscillation clock for an A/D converter (PE.0/MON)
Port E
I/O
OPTION A (C): 1.5 V (3.0 V), Without regulator
circuit for LCD bias
Table 10-1 Ports List
Function
Input-only port
Simultaneous key depression reset function
I/O port
I/O port
I/O port
Synchronous serial port clock I/O pin (for transmission)(PC.1/TXC)
Synchronous serial port clock I/O pin (for reception)(PC.2/RXC)
Serial port transmit data output pin (PC.3/TXD)
External 1 interrupt (4-bit OR input)
I/O port
Low-speed oscillation clock output pin (PE.1/TBCCLK)
High-speed oscillation clock output pin (PE.2/HSCLK)
External 2 interrupt (PE.3/INT2)
10 – 1
ML63611 User's Manual
Chapter 10 Ports (INPUT, I/O PORT)
OPTION B (D): 1.5 V (3.0 V), With regulator
circuit for LCD bias
Page
10-2
10-7
10-11
10-19
10-27
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