PZ-50MR2E (serv.man8). Description of major functions - Sharp TV Service Manual (repair manual). Page 7

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99, 1, 3, 4, 2, 100,
98, 96
97, 94, 93, 89, 86,
84, 82, 79, 81, 83,
90, 85, 77, 78, 76,
71, 69
70, 68, 67

9, 10, 11, 12, 13,
14, 15, 16
41, 42, 43, 44, 45,
46, 47, 62

24, 25, 26, 27

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D0-D7

A0-A16

A17-A19/
P4.0, P4.1, P4.4

P0.0-P0.7

P1.0-P1.7
(PWM)

P2.0-P2.3
(ADC)

I/O

O

I/O

I/O

I/O

I

Data bus for external memory or data RAM.

Address bus for external program memory or data RAM.

After power-on P4.0,P4.1,P4.4 work as additional address lines A17…A19.
In port mode, these port lines act as bi-directional I/O port with internal pull-up
resistors. Port pins that have ‘1’ written to them are pulled high by the internal pull-up
resistors and in that state can be used as inputs.
Port 0 is a 8-bit open drain bi-directional I/O-port. Port 0 pins that have 1 written to
them float: in this state they can be used as high impedance inputs.
Port is a 8-bit bi-directional multifunction I/O port with internal pull-up resistors. Port 1
pins that have 1 written to them are pulled high by the internal pull-up resistors and in
that state can be used as inputs.
The secondary functions of port 1 pins are:
Port bits P1.0-P1.5 contain the 6 output channels of the 8-bit pulse width modulation
unit.
Port bits P1.6-P1.7 contain the two output channels of the 14-bit pulse width
modulation unit.
Port 2 is a 4-bit input port without pull-up resistors.
Port 2 also works as analog input for the 4-channel-ADC.