參數資料
型號: PIC16F74T-I/PT
廠商: Microchip Technology
文件頁數: 23/104頁
文件大小: 0K
描述: IC MCU FLASH 4KX14 A/D 44TQFP
產品培訓模塊: Asynchronous Stimulus
標準包裝: 1,200
系列: PIC® 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數: 33
程序存儲器容量: 7KB(4K x 14)
程序存儲器類型: 閃存
RAM 容量: 192 x 8
電壓 - 電源 (Vcc/Vdd): 4 V ~ 5.5 V
數據轉換器: A/D 8x8b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-TQFP
包裝: 帶卷 (TR)
PIC18F45J10 FAMILY
DS39682E-page 172
2009 Microchip Technology Inc.
16.4.4.5
Clock Synchronization and
the CKP bit
When the CKP bit is cleared, the SCLx output is forced
to ‘0’. However, clearing the CKP bit will not assert the
SCLx output low until the SCLx output is already sam-
pled low. Therefore, the CKP bit will not assert the
SCLx line until an external I2C master device has
already asserted the SCLx line. The SCLx output will
remain low until the CKP bit is set and all other
devices on the I2C bus have deasserted SCLx. This
ensures that a write to the CKP bit will not violate the
minimum high time requirement for SCLx (see
FIGURE 16-12:
CLOCK SYNCHRONIZATION TIMING
SDAx
SCLx
DX – 1
DX
WR
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
SSPxCON
CKP
Master Device
Deasserts Clock
Master Device
Asserts Clock
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