參數(shù)資料
型號(hào): PIC24FJ64GA106-I/PT
廠商: Microchip Technology
文件頁(yè)數(shù): 40/330頁(yè)
文件大?。?/td> 0K
描述: MCU PIC 64KB FLASH 64TQFP
特色產(chǎn)品: PIC24FJ/33FJ MCUs & dsPIC? DSCs
標(biāo)準(zhǔn)包裝: 119
系列: PIC® 24F
核心處理器: PIC
芯體尺寸: 16-位
速度: 32MHz
連通性: I²C,IrDA,LIN,SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,LVD,POR,PWM,WDT
輸入/輸出數(shù): 53
程序存儲(chǔ)器容量: 64KB(22K x 24)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 16K x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 16x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 64-TQFP
包裝: 托盤
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PIC24FJ256GA110 FAMILY
DS39905E-page 134
2010 Microchip Technology Inc.
10.4.5
CONSIDERATIONS FOR
PERIPHERAL PIN SELECTION
The ability to control Peripheral Pin Select options
introduces several considerations into application
design that could be overlooked. This is particularly
true for several common peripherals that are available
only as remappable peripherals.
The main consideration is that the Peripheral Pin
Selects are not available on default pins in the device’s
default (Reset) state. Since all RPINRx registers reset
to ‘111111’ and all RPORx registers reset to ‘000000’,
all Peripheral Pin Select inputs are tied to VSS and all
Peripheral Pin Select outputs are disconnected.
This situation requires the user to initialize the device
with the proper peripheral configuration before any
other application code is executed. Since the IOLOCK
bit resets in the unlocked state, it is not necessary to
execute the unlock sequence after the device has
come out of Reset. For application safety, however, it is
best to set IOLOCK and lock the configuration after
writing to the control registers.
Because the unlock sequence is timing critical, it must
be executed as an assembly language routine in the
same manner as changes to the oscillator configura-
tion. If the bulk of the application is written in C or
another high-level language, the unlock sequence
should be performed by writing in-line assembly.
Choosing the configuration requires the review of all
Peripheral Pin Selects and their pin assignments,
especially those that will not be used in the application.
In all cases, unused pin-selectable peripherals should
be disabled completely. Unused peripherals should
have their inputs assigned to an unused RPn pin
function. I/O pins with unused RPn functions should be
configured with the null peripheral output.
The assignment of a peripheral to a particular pin does
not automatically perform any other configuration of the
pin’s I/O circuitry. In theory, this means adding a
pin-selectable output to a pin may mean inadvertently
driving an existing peripheral input when the output is
driven. Users must be familiar with the behavior of
other fixed peripherals that share a remappable pin and
know when to enable or disable them. To be safe, fixed
digital peripherals that share the same pin should be
disabled when not in use.
Along these lines, configuring a remappable pin for a
specific peripheral does not automatically turn that
feature on. The peripheral must be specifically config-
ured for operation and enabled, as if it were tied to a fixed
pin. Where this happens in the application code (immedi-
ately following device Reset and peripheral configuration
or inside the main application routine) depends on the
peripheral and its use in the application.
A final consideration is that Peripheral Pin Select func-
tions neither override analog inputs, nor reconfigure
pins with analog functions for digital I/O. If a pin is
configured as an analog input on device Reset, it must
be explicitly reconfigured as digital I/O when used with
a Peripheral Pin Select.
Example 10-2 shows a configuration for bidirectional
communication with flow control using UART1. The
following input and output functions are used:
Input Functions: U1RX, U1CTS
Output Functions: U1TX, U1RTS
EXAMPLE 10-2:
CONFIGURING UART1
INPUT AND OUTPUT
FUNCTIONS
Note:
In tying Peripheral Pin Select inputs to
RP63, RP63 does not have to exist on a
device for the registers to be reset to it.
// Unlock Registers
__builtin_write_OSCCONL(OSCCON & 0xBF);
// Configure Input Functions (Table 9-1))
// Assign U1RX To Pin RP0
RPINR18bits.U1RXR = 0;
// Assign U1CTS To Pin RP1
RPINR18bits.U1CTSR = 1;
// Configure Output Functions (Table 9-2)
// Assign U1TX To Pin RP2
RPOR1bits.RP2R = 3;
// Assign U1RTS To Pin RP3
RPOR1bits.RP3R = 4;
// Lock Registers
__builtin_write_OSCCONL(OSCCON | 0x40);
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