PIC16C774I データシートの表示（PDF） - Microchip Technology
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PIC16C774I Datasheet PDF : 202 Pages
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PIC16C77X
TABLE 1-2 PIC16C774 PINOUT DESCRIPTION
Pin Name
DIP PLCC QFP I/O/P
Pin# Pin# Pin# Type
Buffer
Type
Description
OSC1/CLKIN
13
14
30
I ST/CMOS(4) Oscillator crystal input/external clock source input.
OSC2/CLKOUT
14
15
31
O
—
Oscillator crystal output. Connects to crystal or resonator
in crystal oscillator mode. In RC mode, OSC2 pin outputs
CLKOUT which has 1/4 the frequency of OSC1, and
denotes the instruction cycle rate.
MCLR/VPP
1
2
18 I/P
ST
Master clear (reset) input or programming voltage input.
This pin is an active low reset to the device.
PORTA is a bi-directional I/O port.
RA0/AN0
2
3
19 I/O
TTL
RA0 can also be analog input0
RA1/AN1
3
4
20 I/O
TTL
RA2/AN2/VREF-/VRL
4
5
21 I/O
TTL
RA3/AN3/VREF+/VRH 5
6
22 I/O
TTL
RA1 can also be analog input1
RA2 can also be analog input2 or negative analog
reference voltage input or internal voltage reference
low
RA3 can also be analog input3 or positive analog
reference voltage input or internal voltage reference
high
RA4/T0CKI
6
7
23 I/O
ST
RA4 can also be the clock input to the Timer0 timer/
counter. Output is open drain type.
RA5/AN4
7
8
24 I/O
TTL
RA5 can also be analog input4
RB0/INT
RB1/SS
33
36
34
37
PORTB is a bi-directional I/O port. PORTB can be soft-
ware programmed for internal weak pull-up on all inputs.
8
I/O TTL/ST(1)
RB0 can also be the external interrupt pin.
9
I/O TTL/ST(1)
RB1 can also be the SSP slave select
RB2/AN8
35
38
10 I/O
TTL
RB2 can also be analog input8
RB3/AN9/LVDIN
36
39
11 I/O
TTL
RB3 can also be analog input9 or input reference for
low voltage detect
RB4
37
41
14 I/O
TTL
Interrupt on change pin.
RB5
38
42
15 I/O
TTL
Interrupt on change pin.
RB6
39
43
16
I/O
TTL/ST(2)
Interrupt on change pin. Serial programming clock.
RB7
40
44
17
I/O
TTL/ST(2)
Interrupt on change pin. Serial programming data.
Legend:
Note 1:
2:
3:
4:
I = input O = output
I/O = input/output
P = power
— = Not used
TTL = TTL input
ST = Schmitt Trigger input
This buffer is a Schmitt Trigger input when configured for the multiplexed function.
This buffer is a Schmitt Trigger input when used in serial programming mode.
This buffer is a Schmitt Trigger input when configured as general purpose I/O and a TTL input when used in the Parallel
Slave Port mode (for interfacing to a microprocessor bus).
This buffer is a Schmitt Trigger input when configured in RC oscillator mode and a CMOS input otherwise.
DS30275B-page 8
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