參數(shù)資料
型號(hào)： ATMEGA645V-8AI
廠商： Atmel
文件頁(yè)數(shù)： 24/85頁(yè)
文件大?。?/td> 0K
描述： IC AVR MCU FLASH 64K 1.8V 64TQFP
產(chǎn)品培訓(xùn)模塊： megaAVR Introduction
標(biāo)準(zhǔn)包裝： 90
系列： AVR® ATmega
核心處理器： AVR
芯體尺寸： 8-位
速度： 8MHz
連通性： SPI，UART/USART，USI
外圍設(shè)備： 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 53
程序存儲(chǔ)器容量： 64KB（32K x 16）
程序存儲(chǔ)器類型： 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量： 4K x 8
電壓 - 電源 (Vcc/Vdd)： 1.8 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x10b
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
PIC16(L)F1824/1828
DS41419C-page 248
Preliminary
2010-2011 Microchip Technology Inc.
25.2.2 SPI MODE OPERATION
When initializing the SPI, several options need to be
specified. This is done by programming the appropriate
control bits (SSP1CON1<5:0> and SSP1STAT<7:6>).
These control bits allow the following to be specified:
Master mode (SCK1 is the clock output)
Slave mode (SCK1 is the clock input)
Clock Polarity (Idle state of SCK1)
Data Input Sample Phase (middle or end of data
output time)
Clock Edge (output data on rising/falling edge of
SCK1)
Clock Rate (Master mode only)
Slave Select mode (Slave mode only)
To enable the serial port, SSP1 Enable bit, SSP1EN of
the SSP1CON1 register, must be set. To reset or
reconfigure SPI mode, clear the SSP1EN bit, re-initial-
ize the SSP1CONx registers and then set the SSP1EN
bit. This configures the SDI, SDO, SCK and SS pins as
serial port pins. For the pins to behave as the serial port
function, some must have their data direction bits (in
the TRIS register) appropriately programmed as fol-
lows:
SDI must have corresponding TRIS bit set
SDO must have corresponding TRIS bit cleared
SCK (Master mode) must have corresponding
TRIS bit cleared
SCK (Slave mode) must have corresponding
TRIS bit set
SS must have corresponding TRIS bit set
Any serial port function that is not desired may be
overridden by programming the corresponding data
direction (TRIS) register to the opposite value.
The MSSP1 consists of a transmit/receive shift register
(SSP1SR) and a buffer register (SSP1BUF). The
SSP1SR shifts the data in and out of the device, MSb
first. The SSP1BUF holds the data that was written to
the SSP1SR until the received data is ready. Once the
8 bits of data have been received, that byte is moved to
the SSP1BUF register. Then, the Buffer Full Detect bit,
BF of the SSP1STAT register, and the interrupt flag bit,
SSP1IF, are set. This double-buffering of the received
data (SSP1BUF) allows the next byte to start reception
before reading the data that was just received. Any
write
to
the
SSP1BUF
register
during
transmission/reception of data will be ignored and the
write collision detect bit WCOL of the SSP1CON1
register, will be set. User software must clear the
WCOL bit to allow the following write(s) to the
SSP1BUF register to complete successfully.
When the application software is expecting to receive
valid data, the SSP1BUF should be read before the
next byte of data to transfer is written to the SSP1BUF.
The Buffer Full bit, BF of the SSP1STAT register,
indicates when SSP1BUF has been loaded with the
received data (transmission is complete). When the
SSP1BUF is read, the BF bit is cleared. This data may
be irrelevant if the SPI is only a transmitter. Generally,
the MSSP1 interrupt is used to determine when the
transmission/reception has completed. If the interrupt
method is not going to be used, then software polling
can be done to ensure that a write collision does not
occur.
The SSP1SR is not directly readable or writable and
can only be accessed by addressing the SSP1BUF
register. Additionally, the SSP1STAT register indicates
the various Status conditions.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ATmega645V-8AU 功能描述:8位微控制器 -MCU AVR 64K FLASH 2K EE 4K SRAM ADC 1.8V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ATMEGA645V-8AUR 功能描述:8位微控制器 -MCU AVR 64KB FLSH 2KB EE 4KB SRAM-8MHz, IND RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ATmega645V-8MI 功能描述:8位微控制器 -MCU AVR 64K FLASH 2K EE 4K SRAM ADC 1.8V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ATmega645V-8MU 功能描述:8位微控制器 -MCU AVR 64K FLASH 2K EE 4K SRAM ADC 1.8V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ATMEGA645V-8MUR 功能描述:8位微控制器 -MCU AVR 64KB FLSH 2KB EE 4KB SRAM-8MHz, IND RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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