參數(shù)資料
型號： ATMEGA649V-8AUR
廠商： Atmel
文件頁數(shù)： 78/146頁
文件大?。?/td> 0K
描述： IC AVR MCU FLASH 64K 1.8V 64TQFP
產品培訓模塊： megaAVR Introduction
標準包裝： 1,000
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
外圍設備： 欠壓檢測/復位，LCD，POR，PWM，WDT
輸入/輸出數(shù)： 53
程序存儲器容量： 64KB（32K x 16）
程序存儲器類型： 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)轉換器： A/D 8x10b
振蕩器型： 內部
工作溫度： -40°C ~ 85°C
封裝/外殼： 64-TQFP
包裝： 帶卷 (TR)
其它名稱： ATMEGA649V-8AUR-ND
ATMEGA649V-8AURTR
PIC16(L)F1825/1829
DS41440C-page 320
2010-2012 Microchip Technology Inc.
26.5
EUSART Operation During Sleep
The EUSART will remain active during Sleep only in the
Synchronous Slave mode. All other modes require the
system clock and therefore cannot generate the
necessary signals to run the Transmit or Receive Shift
registers during Sleep.
Synchronous Slave mode uses an externally generated
clock to run the Transmit and Receive Shift registers.
26.5.1
SYNCHRONOUS RECEIVE DURING
SLEEP
To receive during Sleep, all the following conditions
must be met before entering Sleep mode:
RCSTA and TXSTA Control registers must be
configured for Synchronous Slave Reception (see
If interrupts are desired, set the RCIE bit of the
PIE1 register and the GIE and PEIE bits of the
INTCON register.
The RCIF interrupt flag must be cleared by
reading RCREG to unload any pending
characters in the receive buffer.
Upon entering Sleep mode, the device will be ready to
accept data and clocks on the RX/DT and TX/CK pins,
respectively. When the data word has been completely
clocked in by the external device, the RCIF interrupt
flag bit of the PIR1 register will be set. Thereby, waking
the processor from Sleep.
Upon waking from Sleep, the instruction following the
SLEEP instruction will be executed. If the GIE, Global
Interrupt Enable, bit of the INTCON register is also set,
then the Interrupt Service Routine at address 004h will
be called.
26.5.2
SYNCHRONOUS TRANSMIT
DURING SLEEP
To transmit during Sleep, all the following conditions
must be met before entering Sleep mode:
RCSTA and TXSTA Control registers must be
configured for synchronous slave transmission
).
The TXIF interrupt flag must be cleared by writing
the output data to the TXREG, thereby filling the
TSR and transmit buffer.
If interrupts are desired, set the TXIE bit of the
PIE1 register and the PEIE bit of the INTCON
register.
Interrupt enable bits TXIE of the PIE1 register and
PEIE of the INTCON register must set.
Upon entering Sleep mode, the device will be ready to
accept clocks on TX/CK pin and transmit data on the
RX/DT pin. When the data word in the TSR has been
completely clocked out by the external device, the
pending byte in the TXREG will transfer to the TSR and
the TXIF flag will be set. Thereby, waking the processor
from Sleep. At this point, the TXREG is available to
accept another character for transmission, which will
clear the TXIF flag.
Upon waking from Sleep, the instruction following the
SLEEP instruction will be executed. If the Global
Interrupt Enable (GIE) bit is also set then the Interrupt
Service Routine at address 0004h will be called.
26.5.3
ALTERNATE PIN LOCATIONS
This module incorporates I/O pins that can be moved to
other locations with the use of the alternate pin function
registers, APFCON0 and APFCON1. To determine
which pins can be moved and what their default
locations are upon a Reset, see Section 12.1
for more information.
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