Philips ACT-500 Service Manual page 12

PIN DESCRIPTIONS OF IC
MCU MN101C39C_399
Name No.
P20 38 Input
P21 39
P22 40
P23 41
P27 32 Input
P40 42 I/O
P41 43
P42 44
P43 45
P44 46
P45 47
P46 48
P47 49
P50 50 I/O
P51 51
P52 52
P53 53
P54 54
P60 55 I/O
P61 56
P62 57
P63 58
P64 59
P65 60
P66 61
P67 62
P70 63 I/O
P71 64
P72 65
P73 66
P73 67
P75 68
P76 69
P77 70
I / O Other Func t ion
IRQ0
IRQ1, SENS
IRQ2
IRQ3
NRST
KEY0
KEY1
KEY2
KEY3
KEY4
KEY5
KEY6
KEY7
NWE, LED0
NRE, LED1
NCS, LED2
A16, LED3, SEG27
A17, LED4, SEG26
A0, SEG25
A1, SEG24
A2, SEG23
A3, SEG22
A4, SEG21
A5, SEG20
A6, SEG19
A7, SEG18
A8, SD0O, SEG17
A9, SDO1, SEG16
A10, SDO2, SEG15
A11, SDO3, SEG14
A12, SDO4, SEG13
A13, SDO5, SEG12
A14, SDO6, SEG11
A15, SDO7, SEG10
3 - 2
Func tion
Input port 2 4-bit input port.
A pull-up resi stor for each bi t can be selected
individually by the P2PLU register. At reset, pull-up
resistors are disabled.
Input port 2 P27 has an n-channel open-drain configuration. When
"0" is written and the reset is initiated by software, a
low level will be output.
I/O port 4 8-bit CMOS tri-state I/O port.
Each bit can be set individually as either an input or
output by the P4DIR register. A pull-up resistor for each
bit can be selected individually by the P4PLU register.
At reset, the input mode is selected and pull-up
resistors are disabled (high impedance output).
I/O port 5 5-bit CMOS tri-state I/O port.
Each bit can be set individually as either an input or
output by the P5DIR register. A pull-up resistor for each
bit can be selected individually by the P5PLU register.
At reset, when single chip mode is selected, the input
mode is selected and pull-up resistors for P50 to P54
are disabled (high impedance output).
When output mode is selected, P50 to P54 can be
used for LED direct drive, and P53 and P54 can be
used for segment drive.
I/O port 6 8-bit CMOS tri-state I/O port.
Each bit can be set individually as either an input or
output by the P6DIR register. A pull-up resistor for each
bit can be selected individually by the P6PLU register.
At reset, when single chip mode is selected, the input
mode is selected and pull-up resistors for P60 to P67
are disabled (high impedance output).
When output mode is selected, these pins can be used
for segment drive.
I/O port 7 8-bit CMOS tri-state I/O port.
Each bit can be set individually as either an input or
output by the P7DIR register. A pull-up or pull-down
resistor for each bit can be selected individually by the
P7PLUD register. However, pull-up and pull-down
resistors cannot be mixed.
This port have a synchronous output function for
external 2 interrupt, timer 1 interrupt, timer 2 interrupt
and timer 4 interrupt.
At reset, when single-chip mode is selected, the input
mode is selected and pull-up resistors for P70 to P77
are disabled (high impedance output).
When output mode is selected, these pins can be used
for segment drive.
Desc ription