I2
參數(shù)資料
型號(hào)： ATTINY261A-XUR
廠商： Atmel
文件頁(yè)數(shù)： 64/296頁(yè)
文件大?。?/td> 0K
描述： MCU AVR 2KB FLASH 20MHZ 20TSSOP
產(chǎn)品培訓(xùn)模塊： tinyAVR Introduction
標(biāo)準(zhǔn)包裝： 4,000
系列： AVR® ATtiny
核心處理器： AVR
芯體尺寸： 8-位
速度： 20MHz
連通性： USI
外圍設(shè)備： 欠壓檢測(cè)/復(fù)位，POR，PWM，溫度傳感器，WDT
輸入/輸出數(shù)： 16
程序存儲(chǔ)器容量： 2KB（1K x 16）
程序存儲(chǔ)器類型： 閃存
EEPROM 大?。?/td> 128 x 8
RAM 容量： 128 x 8
電壓 - 電源 (Vcc/Vdd)： 1.8 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 11x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 20-TSSOP（0.173"，4.40mm 寬）
包裝： 帶卷 (TR)
其它名稱： ATTINY261A-XUR-ND
ATTINY261A-XURTR
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PIC18CXX8
DS30475A-page 156
Advanced Information
2000 Microchip Technology Inc.
15.4.8
I2C MASTER MODE TRANSMISSION
Transmission of a data byte, a 7-bit address, or the
other half of a 10-bit address, is accomplished by sim-
ply writing a value to the SSPBUF register. This action
will set the Buffer Full bit, BF, and allow the baud rate
generator to begin counting and start the next transmis-
sion. Each bit of address/data will be shifted out onto
the SDA pin after the falling edge of SCL is asserted
(see data hold time specification parameter 106). SCL
is held low for one baud rate generator roll over count
(TBRG). Data should be valid before SCL is released
high (see data setup time specification parameter 107).
When the SCL pin is released high, it is held that way
for TBRG. The data on the SDA pin must remain stable
for that duration and some hold time after the next fall-
ing edge of SCL. After the eighth bit is shifted out (the
falling edge of the eighth clock), the BF bit is cleared
and the master releases SDA, allowing the slave
device being addressed to respond with an ACK bit
during the ninth bit time if an address match occurs, or
if data was received properly.
The status of ACK is
written into the ACKDT bit on the falling edge of the
ninth clock. If the master receives an acknowledge, the
Acknowledge Status bit, ACKSTAT, is cleared. If not,
the bit is set. After the ninth clock, the SSPIF bit is set
and the master clock (baud rate generator) is sus-
pended until the next data byte is loaded into the SSP-
BUF,
leaving
SCL
low
and
SDA
unchanged
After the write to the SSPBUF, each bit of address will
be shifted out on the falling edge of SCL, until all seven
address bits and the R/W bit, are completed. On the
falling edge of the eighth clock, the master will
de-assert the SDA pin, allowing the slave to respond
with an acknowledge. On the falling edge of the ninth
clock, the master will sample the SDA pin to see if the
address was recognized by a slave. The status of the
ACK bit is loaded into the ACKSTAT status bit
(SSPCON2 register). Following the falling edge of the
ninth clock transmission of the address, the SSPIF is
set, the BF bit is cleared and the baud rate generator is
turned off, until another write to the SSPBUF takes
place, holding SCL low and allowing SDA to float.
15.4.8.1
BF Status Flag
In Transmit mode, the BF bit (SSPSTAT register) is set
when the CPU writes to SSPBUF, and is cleared when
all eight bits are shifted out.
15.4.8.2
WCOL Status Flag
If the user writes the SSPBUF when a transmit is
already in progress (i.e., SSPSR is still shifting out a
data byte), the WCOL is set and the contents of the
buffer are unchanged (the write doesn’t occur).
WCOL must be cleared in software.
15.4.8.3
ACKSTAT Status Flag
In Transmit mode, the ACKSTAT bit (SSPCON2
register) is cleared when the slave has sent an
acknowledge (ACK = 0), and is set when the slave
does not acknowledge (ACK = 1). A slave sends an
acknowledge when it has recognized its address
(including a general call), or when the slave has
properly received its data.
15.4.9
I2C MASTER MODE RECEPTION
Master mode reception is enabled by programming the
Receive Enable bit, RCEN (SSPCON2 register).
The baud rate generator begins counting, and on each
rollover, the state of the SCL pin changes (high to
low/low to high) and data is shifted into the SSPSR.
After the falling edge of the eighth clock, the RCEN bit
is automatically cleared, the contents of the SSPSR are
loaded into the SSPBUF, the BF bit is set, the SSPIF
flag bit is set and the baud rate generator is suspended
from counting, holding SCL low. The MSSP is now in
IDLE state, awaiting the next command. When the
buffer is read by the CPU, the BF bit is automatically
cleared. The user can then send an Acknowledge bit at
the end of reception, by setting the Acknowledge
Sequence Enable bit ACKEN (SSPCON2 register).
15.4.9.1
BF Status Flag
In receive operation, the BF bit is set when an address
or data byte is loaded into SSPBUF from SSPSR. It is
cleared when the SSPBUF register is read.
15.4.9.2
SSPOV Status Flag
In receive operation, the SSPOV bit is set when eight
bits are received into the SSPSR and the BF bit is
already set from a previous reception.
15.4.9.3
WCOL Status Flag
If the user writes the SSPBUF when a receive is
already in progress (i.e., SSPSR is still shifting in a data
byte), the WCOL bit is set and the contents of the buffer
are unchanged (the write doesn’t occur).
Note:
The MSSP module must be in an IDLE
state before the RCEN bit is set, or the
RCEN bit will be disregarded.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ATTINY261-ESMZ 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
ATTINY261-ESSZ 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
ATTINY261-ESXZ 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
ATTINY261V 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
ATTINY261V-10MU 功能描述:8位微控制器 -MCU AVR 2K FLASH 128B EE 128B SRAM ADC 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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