參數(shù)資料
型號(hào)： DSPIC30F4012-20I/SO
廠商： Microchip Technology
文件頁(yè)數(shù)： 12/238頁(yè)
文件大小： 0K
描述： IC DSPIC MCU/DSP 48K 28SOIC
產(chǎn)品培訓(xùn)模塊： dsPIC30F Quadrature Encoder Interface
Serial Communications using dsPIC30F CAN
Serial Communications using dsPIC30F I2C
Serial Communications using dsPIC30F SPI
Serial Communications using dsPIC30F UART
dsPIC30F 12 bit ADC - Part 2
dsPIC30F Addressing Modes - Part 1
dsPIC30F Architecture - Part 1
dsPIC30F DSP Engine & ALU
dsPIC30F Interrupts
dsPIC30F Motor Control PWM
dsPIC Timers
Asynchronous Stimulus
dsPIC30F Addressing Modes - Part 2
dsPIC30F Architecture - Part 2
dsPIC30F 12-bit ADC Part 1
標(biāo)準(zhǔn)包裝： 27
系列： dsPIC™ 30F
核心處理器： dsPIC
芯體尺寸： 16-位
速度： 20 MIPS
連通性： CAN，I²C，SPI，UART/USART
外圍設(shè)備： 高級(jí)欠壓探測(cè)/復(fù)位，電機(jī)控制 PWM，QEI，POR，PWM，WDT
輸入/輸出數(shù)： 20
程序存儲(chǔ)器容量： 48KB（16K x 24）
程序存儲(chǔ)器類(lèi)型： 閃存
EEPROM 大?。?/td> 1K x 8
RAM 容量： 2K x 8
電壓 - 電源 (Vcc/Vdd)： 2.5 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 6x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
包裝： 管件
配用： XLT28SO-1-ND - SOCKET TRANSITION 28SOIC 300MIL
其它名稱(chēng)： DSPIC30F401220ISO
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2010 Microchip Technology Inc.
DS70135G-page 109
dsPIC30F4011/4012
16.0
SPI MODULE
The Serial Peripheral Interface (SPI) module is a
synchronous serial interface. It is useful for communi-
cating
with
other
peripheral
devices,
such
as
EEPROMs, shift registers, display drivers and A/D
converters, or other microcontrollers. It is compatible
with Motorola’s SPI and SIOP interfaces.
16.1
Operating Function Description
The SPI module consists of a 16-bit shift register,
SPI1SR, used for shifting data in and out, and a buffer
register, SPI1BUF. A control register, SPI1CON,
configures the module. Additionally, a status register,
SPI1STAT, indicates various status conditions.
The serial interface consists of 4 pins: SDI1 (Serial Data
Input), SDO1 (Serial Data Output), SCK1 (Shift Clock
Input or Output), and SS1 (active-low Slave Select).
In Master mode operation, SCK1 is a clock output, but
in Slave mode, it is a clock input.
A series of eight (8) or sixteen (16) clock pulses shift
out bits from the SPI1SR to SDO1 pin, and simultane-
ously, shifts in data from SDI1 pin. An interrupt is gen-
erated when the transfer is complete and the
corresponding interrupt flag bit (SPI1IF) is set. This
interrupt can be disabled through an interrupt enable
bit (SPI1IE).
The receive operation is double-buffered. When a
complete byte is received, it is transferred from
SPI1SR to SPI1BUF.
If the receive buffer is full when new data is being
transferred from SPI1SR to SPI1BUF, the module will
set the SPIROV bit, indicating an overflow condition.
The transfer of the data from SPI1SR to SPI1BUF will
not be completed and the new data will be lost. The
module will not respond to SCL transitions while
SPIROV is ‘1’, effectively disabling the module until
SPI1BUF is read by user software.
Transmit writes are also double-buffered. The user
writes to SPI1BUF. When the master or slave transfer
is completed, the contents of the shift register
(SPI1SR) is moved to the receive buffer. If any trans-
mit data has been written to the buffer register, the
contents of the transmit buffer are moved to SPI1SR.
The received data is thus placed in SPI1BUF and the
transmit data in SPI1SR is ready for the next transfer.
In Master mode, the clock is generated by prescaling
the system clock. Data is transmitted as soon as a
value is written to SPI1BUF. The interrupt is generated
at the middle of the transfer of the last bit.
In Slave mode, data is transmitted and received as
external clock pulses appear on SCK1. Again, the
interrupt is generated when the last bit is latched. If
SS1 control is enabled, then transmission and recep-
tion are enabled only when SS1 = low. The SDO1
output will be disabled in SS1 mode with SS1 high.
The clock provided to the module is (FOSC/4). This
clock is then prescaled by the primary (PPRE<1:0>)
and secondary (SPRE<2:0>) prescale factors. The
CKE bit determines whether transmit occurs on transi-
tion from active clock state to Idle clock state, or vice
versa. The CKP bit selects the Idle state (high or low)
for the clock.
16.1.1
WORD AND BYTE
COMMUNICATION
A control bit, MODE16 (SPI1CON<10>), allows the
module to communicate in either 16-bit or 8-bit mode.
16-bit operation is identical to 8-bit operation, except
that the number of bits transmitted is 16 instead of 8.
The user software must disable the module prior to
changing the MODE16 bit. The SPI module is reset
when the MODE16 bit is changed by the user.
A basic difference between 8-bit and 16-bit operation is
that the data is transmitted out of bit 7 of the SPI1SR
for 8-bit operation, and data is transmitted out of bit 15
of the SPI1SR for 16-bit operation. In both modes, data
is shifted into bit 0 of the SPI1SR.
16.1.2
SDO1 DISABLE
A control bit, DISSDO, is provided to the SPI1CON
register to allow the SDO1 output to be disabled. This
will allow the SPI module to be connected in an input
only configuration. SDO1 can also be used for general
purpose I/O.
Note:
This data sheet summarizes features of
this group of dsPIC30F devices and is not
intended to be a complete reference
source. For more information on the CPU,
peripherals,
register
descriptions
and
general device functionality, refer to the
dsPIC30F
Family
Reference
Manual
(DS70046). For more information on the
device instruction set and programming,
refer to the “16-bit MCU and DSC
Reference Manual” (DS70157).
Note:
Both the transmit buffer (SPI1TXB) and
the receive buffer (SPI1RXB) are mapped
to the same register address, SPI1BUF.
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