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鍙冩暩(sh霉)璩囨枡
| 鍨嬭櫉(h脿o)锛� | ATMEGA649V-8MI |
| 寤犲晢锛� | Atmel |
| 鏂囦欢闋佹暩(sh霉)锛� | 24/146闋� |
| 鏂囦欢澶�?銆�?/td> | 0K |
| 鎻忚堪锛� | IC AVR MCU FLASH 64K 1.8V 64QFN |
| 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″锛� | megaAVR Introduction |
| 妯�(bi膩o)婧�(zh菙n)鍖呰锛� | 260 |
| 绯诲垪锛� | AVR® ATmega |
| 鏍稿績铏曠悊鍣細 | AVR |
| 鑺珨灏哄锛� | 8-浣� |
| 閫熷害锛� | 8MHz |
| 閫ｉ€氭€э細 | SPI锛孶ART/USART锛孶SI |
| 澶栧湇瑷�(sh猫)鍌欙細 | 娆犲妾㈡脯/寰�(f霉)浣嶏紝LCD锛孭OR锛孭WM锛學DT |
| 杓稿叆/杓稿嚭鏁�(sh霉)锛� | 53 |
| 绋嬪簭瀛樺劜(ch菙)鍣ㄥ閲忥細 | 64KB锛�32K x 16锛� |
| 绋嬪簭瀛樺劜(ch菙)鍣ㄩ鍨嬶細 | 闁冨瓨 |
| EEPROM 澶у皬锛� | 2K x 8 |
| RAM 瀹归噺锛� | 4K x 8 |
| 闆诲 - 闆绘簮 (Vcc/Vdd)锛� | 1.8 V ~ 5.5 V |
| 鏁�(sh霉)鎿�(j霉)杞�(zhu菐n)鎻涘櫒锛� | A/D 8x10b |
| 鎸暕鍣ㄥ瀷锛� | 鍏�(n猫i)閮� |
| 宸ヤ綔婧害锛� | -40°C ~ 85°C |
| 灏佽/澶栨锛� | 64-VFQFN 瑁搁湶鐒婄洡 |
| 鍖呰锛� | 鎵樼洡 |
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PIC16(L)F1825/1829
DS41440C-page 272
2010-2012 Microchip Technology Inc.
25.6
I2C MASTER MODE
Master mode is enabled by setting and clearing the
appropriate SSPM bits in the SSPxCON1 register and
by setting the SSPEN bit. In Master mode, the SDAx
and SCKx pins must be configured as inputs. The
MSSP peripheral hardware will override the output
driver TRIS controls when necessary to drive the pins
low.
Master mode of operation is supported by interrupt
generation on the detection of the Start and Stop
conditions. The Stop (P) and Start (S) bits are cleared
from a Reset or when the MSSPx module is disabled.
Control of the I2C bus may be taken when the P bit is
set, or the bus is Idle.
In Firmware Controlled Master mode, user code
conducts all I2C bus operations based on Start and
Stop bit condition detection. Start and Stop condition
detection is the only active circuitry in this mode. All
other communication is done by the user software
directly manipulating the SDAx and SCLx lines.
The following events will cause the SSPx Interrupt Flag
bit, SSPxIF, to be set (SSPx interrupt, if enabled):
Start condition detected
Stop condition detected
Data transfer byte transmitted/received
Acknowledge transmitted/received
Repeated Start generated
25.6.1
I2C MASTER MODE OPERATION
The master device generates all of the serial clock
pulses and the Start and Stop conditions. A transfer is
ended with a Stop condition or with a Repeated Start
condition. Since the Repeated Start condition is also
the beginning of the next serial transfer, the I2C bus will
not be released.
In Master Transmitter mode, serial data is output
through SDAx, while SCLx outputs the serial clock. The
first byte transmitted contains the slave address of the
receiving device (7 bits) and the Read/Write (R/W) bit.
In this case, the R/W bit will be logic 鈥�0鈥�. Serial data is
transmitted eight bits at a time. After each byte is
transmitted, an Acknowledge bit is received. Start and
Stop conditions are output to indicate the beginning
and the end of a serial transfer.
In Master Receive mode, the first byte transmitted
contains the slave address of the transmitting device
(7 bits) and the R/W bit. In this case, the R/W bit will be
logic 鈥�1鈥�. Thus, the first byte transmitted is a 7-bit slave
address followed by a 鈥�1鈥� to indicate the receive bit.
Serial data is received via SDAx, while SCLx outputs
the serial clock. Serial data is received eight bits at a
time. After each byte is received, an Acknowledge bit is
transmitted. Start and Stop conditions indicate the
beginning and end of transmission.
A Baud Rate Generator is used to set the clock
frequency output on SCLx. See Section 25.7 鈥淏aud
for more detail.
Note 1:
The MSSPx module, when configured in
I2C Master mode, does not allow
queueing of events. For instance, the user
is not allowed to initiate a Start condition
and immediately write the SSPxBUF
register to initiate transmission before the
Start condition is complete. In this case,
the SSPxBUF will not be written to and the
WCOL bit will be set, indicating that a
write to the SSPxBUF did not occur
2:
When
in
Master
mode,
Start/Stop
detection is masked and an interrupt is
generated when the SEN/PEN bit is
cleared and the generation is complete.
鐩搁棞(gu膩n)PDF璩囨枡 |
PDF鎻忚堪 |
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鐩搁棞(gu膩n)浠ｇ悊鍟�/鎶€琛�(sh霉)鍙冩暩(sh霉) |
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| ATmega649V-8MU | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU AVR 64K FLASH 2K EE 4K SRAM ADC LCD RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪(sh铆)閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜(ch菙)鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
| ATMEGA649V-8MUR | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU AVR 64KB FLSH 2KB EE 4KB SRAM LCD8MHz1.8V RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪(sh铆)閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜(ch菙)鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
| ATMEGA64A-AN | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 16MHz 105C RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪(sh铆)閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜(ch菙)鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
| ATMEGA64A-ANR | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 16MHz 105C RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪(sh铆)閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜(ch菙)鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
| ATMEGA64A-AU | 鍔熻兘鎻忚堪:8浣嶅井鎺у埗鍣� -MCU 64K Flsh 2K EEPROM 4K SRAM 16MHz RoHS:鍚� 鍒堕€犲晢:Silicon Labs 鏍稿績:8051 铏曠悊鍣ㄧ郴鍒�:C8051F39x 鏁�(sh霉)鎿�(j霉)绺界窔瀵害:8 bit 鏈€澶ф檪(sh铆)閻橀牷鐜�:50 MHz 绋嬪簭瀛樺劜(ch菙)鍣ㄥぇ灏�:16 KB 鏁�(sh霉)鎿�(j霉) RAM 澶у皬:1 KB 鐗囦笂 ADC:Yes 宸ヤ綔闆绘簮闆诲:1.8 V to 3.6 V 宸ヤ綔婧害鑼冨湇:- 40 C to + 105 C 灏佽 / 绠遍珨:QFN-20 瀹夎棰�(f膿ng)鏍�:SMD/SMT |
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