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| 型號(hào)： | 39504 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Section 4. Architecture |
| 中文描述： | 第4節(jié)。建筑 |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大小： | 232K |
| 代理商： | 39504 |
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2000 Microchip Technology Inc.
DS39504A-page 4-9
Section 4 Architecture
A
4
INT0
INT1
INT2
LB
LVDIN
MCLR
I
I
I
ST
ST
ST
—
External Interrupt0
External Interrupt1
External Interrupt2
System bus low byte strobe
Low voltage detect input
Master clear (reset) input or programming voltage input. This pin is
an active low reset to the device.
These pins should be left unconnected.
System bus output enable strobe
Oscillator crystal input or external clock source input. ST buffer when
configured in RC mode. CMOS otherwise.
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.
Parallel Slave Port for interfacing to a microprocessor port. These
pins have TTL input buffers when PSP module is enabled.
O
I
I/P
Analog
ST
NC
OE
OSC1
—
O
I
—
—
ST/CMOS
OSC2
O
—
PSP0
PSP1
PSP2
PSP3
PSP4
PSP5
PSP6
PSP7
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
PORTA is a bi-directional I/O port.
RA0
RA1
RA2
RA3
RA4
RA5
RA6
I/O
I/O
I/O
I/O
I/O
I/O
I/O
TTL
TTL
TTL
TTL
ST
TTL
TTL
RA4 is an open drain when configured as output.
PORTB is a bi-directional I/O port. PORTB can be software pro-
grammed for internal weak pull-ups on all inputs.
RB0
RB1
RB2
RB3
RB4
RB5
RB6
I/O
I/O
I/O
I/O
I/O
I/O
I/O
TTL
TTL
TTL
TTL
TTL
TTL
TTL/ST
Interrupt on change pin.
Interrupt on change pin.
Interrupt on change pin. Serial programming clock. TTL input
buffer as general purpose I/O, Schmitt Trigger input buffer when
used as the serial programming clock.
Interrupt on change pin. Serial programming data. TTL input
buffer as general purpose I/O, Schmitt Trigger input buffer when
used as the serial programming data.
CMOS = CMOS compatible input or output
O = output
I = input
P = Power
RB7
I/O
TTL/ST
Table 4-1:
I/O Descriptions (Continued)
Pin Name
Pin
Type
Buffer
Type
Description
Legend: TTL = TTL-compatible input
ST = Schmitt Trigger input with CMOS levels
PU = Weak internal pull-up
Analog = Analog input or output
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