MG87FE/L2051/4051/6051
Preliminary, v 1.03
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4.2.Pin Description (PDIP-20 & SOP-20)
Pin Name
P1.0~P1.7
Pin Number
12~19
I/O type
I/O
Description
Port1: General-purposed I/O with weak pull-up resistance inside.
When 1s are written into Port1, the strong output driving PMOS
only turn-on two periods and then the weak pull-up resistance
keeps the port high.
P1.0 is the comparator positive input.
P1.1 is the comparator negative input.
P1.2 has a swapped function with P4.2/INT3.
P1.3 has a swapped function with P4.3/INT2.
P1.4 has a swapped function with P3.4/T0.
P1.5 has a swapped function with P3.5/T1.
Port3: General-purposed I/O with weak pull-up resistance inside.
When 1s are written into Port1, the strong output driving PMOS
only turn-on two periods and then the weak pull-up resistance to
keep the port high. Port3 also serves the special function of
MG87FE/L2051/4051/6051.
P3.0~P3.7
2~3,6~9,11
I/O
P3.4 has a swapped function with P1.4.
P3.5 has a swapped function with P1.5.
RESET
1
5
I
RESET: A high on this pin for at least two machine cycles will reset
the device.
Crystal1: Input to the inverting oscillator amplifier.
XTAL1/P4.3
I/O
XTAL1 has an alternate function for P4.3/INT2.
P4.3/INT2 has a swapped function with P1.3.
Crystal2: Output from the inverting amplifier.
XTAL2/P4.2
4
I/O
XTAL2 has an alternate function for P42/INT3.
P4.2/INT3 has a swapped function with P1.2.
VDD
VSS
20
10
P
POWER
G
GROUND
This document information is the intellectual property of Megawin Technology.
© Megawin Technology Co., Ltd. 2009 All rights reserved.
QP-7300-03D
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