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PIC16F877T-20PQ 参数 Datasheet PDF下载

PIC16F877T-20PQ图片预览
型号: PIC16F877T-20PQ
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器\n [8-Bit Microcontroller ]
分类和应用: 微控制器
文件页数/大小: 200 页 / 3338 K
品牌: ETC [ ETC ]
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PIC16F87X  
9.2.13 ACKNOWLEDGE SEQUENCE TIMING  
the baud rate generator counts for TBRG. The SCL pin  
is then pulled low. Following this, the ACKEN bit is auto-  
matically cleared, the baud rate generator is turned off,  
and the SSP module then goes into IDLE mode.  
(Figure 9-16)  
An acknowledge sequence is enabled by setting the  
acknowledge  
sequence  
enable  
bit,  
ACKEN  
(SSPCON2<4>). When this bit is set, the SCL pin is  
pulled low and the contents of the acknowledge data  
bit is presented on the SDA pin. If the user wishes to  
generate an acknowledge, the ACKDT bit should be  
cleared. If not, the user should set the ACKDT bit  
before starting an acknowledge sequence. The baud  
rate generator then counts for one rollover period  
9.2.13.1 WCOL STATUS FLAG  
If the user writes the SSPBUF when an acknowledege  
sequence is in progress, the WCOL is set and the con-  
tents of the buffer are unchanged (the write doesn’t  
occur).  
(T  
), and the SCL pin is deasserted (pulled high).  
BRG  
When the SCL pin is sampled high (clock arbitration),  
FIGURE 9-16: ACKNOWLEDGE SEQUENCE WAVEFORM  
Acknowledge sequence starts here,  
Write to SSPCON2  
ACKEN automatically cleared  
ACKEN = 1, ACKDT = 0  
TBRG  
TBRG  
SDA  
SCL  
D0  
ACK  
8
9
SSPIF  
Cleared in  
software  
Set SSPIF at the end  
of receive  
Cleared in  
software  
Set SSPIF at the end  
of acknowledge sequence  
Note: TBRG = one baud rate generator period.  
1999 Microchip Technology Inc.  
DS30292B-page 85  
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