PIC16F877A-I/L Microchip Technology Inc., PIC16F877A-I/L Datasheet - Page 88
PIC16F877A-I/L
Manufacturer Part Number
PIC16F877A-I/L
Description
44 PIN, 7 KB FLASH, 368 RAM, 33 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC16F877A-IL.pdf
(218 pages)
Specifications of PIC16F877A-I/L
A/d Inputs
8-Channel, 10-Bit
Comparators
2
Cpu Speed
5 MIPS
Eeprom Memory
256 Bytes
Input Output
33
Interface
I2C/SPI/USART
Memory Type
Flash
Number Of Bits
8
Package Type
44-pin PLCC
Programmable Memory
14K Bytes
Ram Size
368 Bytes
Speed
20 MHz
Timers
2-8-bit, 1-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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PIC16F87X
9.2.13
An Acknowledge sequence is enabled by setting the
Acknowledge
(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 gen-
erate 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
(T
SCL pin is sampled high (clock arbitration), the baud
FIGURE 9-16:
DS30292C-page 86
BRG
), and the SCL pin is de-asserted high. When the
Note: T
ACKNOWLEDGE SEQUENCE
TIMING
BRG
SSPIF
Sequence
Acknowledge sequence starts here,
SDA
SCL
= one baud rate generator period.
ACKNOWLEDGE SEQUENCE WAVEFORM
Set SSPIF at the end
of receive
ACKEN = 1, ACKDT = 0
Enable
Write to SSPCON2
bit,
8
D0
ACKEN
Cleared in
software
T
BRG
ACK
rate generator counts for T
pulled low. Following this, the ACKEN bit is automati-
cally cleared, the baud rate generator is turned off,
and the SSP module then goes into IDLE mode
(Figure 9-16).
9.2.13.1
If the user writes the SSPBUF when an Acknowledge
sequence is in progress, the WCOL is set and the con-
tents of the buffer are unchanged (the write doesn’t
occur).
T
BRG
9
Set SSPIF at the end
of Acknowledge sequence
ACKEN automatically cleared
WCOL Status Flag
Cleared in
software
2001 Microchip Technology Inc.
BRG
. The SCL pin is then
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