参数资料
型号: ATMEGA645V-8MUR
厂商: Atmel
文件页数: 47/85页
文件大小: 0K
描述: MCU AVR 64KB FLASH 8MHZ 64QFN
产品培训模块: megaAVR Introduction
标准包装: 4,000
系列: AVR® ATmega
核心处理器: AVR
芯体尺寸: 8-位
速度: 8MHz
连通性: SPI,UART/USART,USI
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 53
程序存储器容量: 64KB(32K x 16)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 4K x 8
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 64-VFQFN 裸露焊盘
包装: 带卷 (TR)
其它名称: ATMEGA645V-8MUR-ND
ATMEGA645V-8MURTR
2010-2011 Microchip Technology Inc.
Preliminary
DS41419C-page 269
PIC16(L)F1824/1828
25.5.4 SLAVE MODE 10-BIT ADDRESS
RECEPTION
This section describes a standard sequence of events
for the MSSP1 module configured as an I2C Slave in
10-bit Addressing mode.
Figure 25-19 is used as a visual reference for this
description.
This is a step by step process of what must be done by
slave software to accomplish I2C communication.
1.
Bus starts Idle.
2.
Master sends Start condition; S bit of
SSP1STAT is set; SSP1IF is set if interrupt on
Start detect is enabled.
3.
Master sends matching high address with R/W
bit clear; UA bit of the SSP1STAT register is set.
4.
Slave sends ACK and SSP1IF is set.
5.
Software clears the SSP1IF bit.
6.
Software
reads
received
address
from
SSP1BUF clearing the BF flag.
7.
Slave loads low address into SSP1ADD,
releasing SCL.
8.
Master sends matching low address byte to the
Slave; UA bit is set.
9.
Slave sends ACK and SSP1IF is set.
10. Slave clears SSP1IF.
11. Slave reads the received matching address
from SSP1BUF clearing BF.
12. Slave loads high address into SSP1ADD.
13. Master clocks a data byte to the slave and
clocks out the slaves ACK on the 9th SCL pulse;
SSP1IF is set.
14. If SEN bit of SSP1CON2 is set, CKP is cleared
by hardware and the clock is stretched.
15. Slave clears SSP1IF.
16. Slave reads the received byte from SSP1BUF
clearing BF.
17. If SEN is set the slave sets CKP to release the
SCL.
18. Steps 13-17 repeat for each received byte.
19. Master sends Stop to end the transmission.
25.5.5 10-BIT ADDRESSING WITH ADDRESS
OR DATA HOLD
Reception using 10-bit addressing with AHEN or
DHEN set is the same as with 7-bit modes. The only
difference is the need to update the SSP1ADD register
using the UA bit. All functionality, specifically when the
CKP bit is cleared and SCL line is held low are the
same. Figure 25-20 can be used as a reference of a
slave in 10-bit addressing with AHEN set.
Figure 25-21 shows a standard waveform for a slave
transmitter in 10-bit Addressing mode.
Note: Updates to the SSP1ADD register are not
allowed until after the ACK sequence.
Note: If the low address does not match, SSP1IF
and UA are still set so that the slave soft-
ware can set SSP1ADD back to the high
address. BF is not set because there is no
match. CKP is unaffected.
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