MDT10P621

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P.2

2005/5 Ver. 1.8

4. Pin Assignment

/MCLR 1

28

PB7

PA0 2

27

PB6

PA1 3

26

PB5

PA2 4

25

PB4

PA3 5

24

PB3

PA4/RTCC 6

23

PB2

PA5/SS 7

22

PB1

21

PB0/INT

OSC1/CLKIN 9

20

OSC2/CLKOUT 10

19

PC0/T1OSO/T1CKI 11

18

PC7

PC1/T1OSI 12

17

PC6

PC2/CCP 13

16

PC5/SDO

PC3/SCK 14

15

PC4/SDI

5. Pin Function Description

Pin Name

I/O

Function Description

PA0~PA3,PA5

I/O

Port A, TTL input level

RTCC/PA4

I/O

Real Time Clock/Counter, Schmitt Trigger input level

Open drain output

PB0~PB7

I/O

Port B, TTL input level / PB0:External interrupt input ,

PB4~PB7:Interrupt on pin change

PC0~PC7

I/O

Port C, Schmitt Trigger input level

/MCLR

I

Master Clear, Schmitt Trigger input level

OSC1/CLKIN

I

Oscillator Input/external clock input

OSC2/CLKOUT

O

Oscillator Output/in RC mode， the CLKOUT pin has 1/4

frequency of CLKIN

Power supply

Ground