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MTV230M64
Page 3 of 31
PIN CONFIGURATION
A “CMOS pin” can be used as Input or Output mode. To use these pins as output mode, S/W needs to set the
corresponding output enable control bit “Pxxoe” to 1. Otherwise, the “Pxxoe” should clear to 0. In output mode,
these pins can sink and drive at least 4mA current.
A “open drain pin” means it can sink at least 4mA current but no drive current to VDD. It can be used as input or
output function and need an external pull up resistor.
A “8051 standard pin” is a pseudo open drain pin. It can sink at least 4mA current when output low level, and
drive at least 4mA current for 160nS when output transit from low to high, then keep drive 100uA to maintain the
pin at high level. It can be used as input or output function. It need an external pull up resistor when drive heavy
load device.
8051 Standard Pin
4mA
4mA
Output
Data
Pin
CMOS Pin (Output Mode)
Pxxoe=1
2 OSC
period
delay
4mA
10uA
Output
Data
120uA
Pin
4mA
Input
Data
Output
Data
CMOS Pin (Input Mode)
Pxxoe=0
No Current
No Current
Pin
Input
Data
5V Open Drain Pin
No Current
4mA
Output
Data
Pin
Input
Data