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| 型號(hào)： | PIC24HJ32GP202T-I/SS |
| 廠商： | Microchip Technology |
| 文件頁(yè)數(shù)： | 8/289頁(yè) |
| 文件大小： | 0K |
| 描述： | MCU PIC 16BIT 32K FLASH 28SSOP |
| 標(biāo)準(zhǔn)包裝： | 2,100 |
| 系列： | PIC® 24H |
| 核心處理器： | PIC |
| 芯體尺寸： | 16-位 |
| 速度： | 40 MIP |
| 連通性： | I²C，IrDA，LIN，SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 21 |
| 程序存儲(chǔ)器容量： | 32KB（11K x 24） |
| 程序存儲(chǔ)器類型： | 閃存 |
| RAM 容量： | 2K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 3 V ~ 3.6 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 10x10b/12b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 28-SSOP（0.209"，5.30mm 寬） |
| 包裝： | 帶卷 (TR) |
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2007-2011 Microchip Technology Inc.
DS70289J-page 105
PIC24HJ32GP202/204 AND PIC24HJ16GP304
10.0
I/O PORTS
All of the device pins (except VDD, VSS, MCLR and
OSC1/CLKI) are shared among the peripherals and the
parallel I/O ports. All I/O input ports feature Schmitt
Trigger inputs for improved noise immunity.
10.1
Parallel I/O (PIO) Ports
A parallel I/O port that shares a pin with a peripheral is
generally
subservient
to
the
peripheral.
The
peripheral’s output buffer data and control signals are
provided to a pair of multiplexers. The multiplexers
select whether the peripheral or the associated port
has ownership of the output data and control signals of
the I/O pin. The logic also prevents “l(fā)oop through”, in
which a port’s digital output can drive the input of a
peripheral that shares the same pin. Figure 10-1 shows
how ports are shared with other peripherals and the
associated I/O pin to which they are connected.
When a peripheral is enabled and the peripheral is
actively driving an associated pin, the use of the pin as
a general purpose output pin is disabled. The I/O pin
can be read, but the output driver for the parallel port bit
is disabled. If a peripheral is enabled, but the peripheral
is not actively driving a pin, that pin can be driven by a
port.
All port pins have three registers directly associated
with their operation as digital I/O. The data direction
register (TRISx) determines whether the pin is an input
or an output. If the data direction bit is ‘1’, then the pin
is an input. All port pins are defined as inputs after a
Reset. Reads from the latch (LATx) read the latch.
Writes to the latch, write the latch. Reads from the port
(PORTx) read the port pins, while writes to the port pins
write the latch.
Any bit and its associated data and control registers
that are not valid for a particular device will be
disabled. This means that the corresponding LATx and
TRISx registers and the port pin will read as zeros.
When a pin is shared with another peripheral or
function that is defined as an input only, it is
nevertheless regarded as a dedicated port because
there is no other competing source of outputs.
FIGURE 10-1:
BLOCK DIAGRAM OF A TYPICAL SHARED PORT STRUCTURE
Note 1:
This data sheet summarizes the features
of
the
PIC24HJ32GP202/204
and
PIC24HJ16GP304 family of devices.
However, it is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to “Section 10. I/O Ports”
(DS70193) of the “dsPIC33F/PIC24H
Family Reference Manual”
, which is
available from the Microchip website
(www.microchip.com).
2:
Some registers and associated bits
described in this section may not be
available on all devices. Refer to
in
this data sheet for device-specific register
and bit information.
Q
D
CK
WR LAT +
TRIS Latch
I/O Pin
WR Port
Data Bus
Q
D
CK
Data Latch
Read Port
Read TRIS
1
0
1
0
WR TRIS
Peripheral Output Data
Output Enable
Peripheral Input Data
I/O
Peripheral Module
Peripheral Output Enable
PIO Module
Output Multiplexers
Output Data
Input Data
Peripheral Module Enable
Read LAT
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