PIC16F872-E/SS Microchip Technology, PIC16F872-E/SS Datasheet - Page 322

• Manufacturer Part Number: PIC16F872-E/SS
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,SSOP,28PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F872-E/SS

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 28-SSOP
• Package: 28SSOP
• Device Core: PIC
• Family Name: PIC16
• Maximum Speed: 20 MHz
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 22
• Interface Type: I2C/SPI
• On-chip Adc: 5-chx10-bit
• Number Of Timers: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PICmicro MID-RANGE MCU FAMILY
17.4.14
17.4.14.1 WCOL Status Flag
DS31017A-page 17-46
Stop Condition Timing
A stop bit is asserted on the SDA pin at the end of a receive/transmit by setting the Stop
sequence enable bit, PEN (SSPCON2<2>). At the end of a receive/transmit the SCL line is held
low after the falling edge of the ninth clock. When the PEN bit is set, the master will assert the
SDA line low. When the SDA line is sampled low, the baud rate generator is reloaded and counts
down to 0. When the baud rate generator times out, the SCL pin will be brought high, and one
T
pin is sampled high while SCL is high the P bit (SSPSTAT<4>) is set. A T
is cleared and the SSPIF bit is set
Whenever the firmware decides to take control of the bus, it will first determine if the bus is busy
by checking the S and P bits in the SSPSTAT register. If the bus is busy, then the CPU can be
interrupted (notified) when a Stop bit is detected (i.e. bus is free).
If the user writes the SSPBUF when a STOP sequence is in progress, then the WCOL bit is set
and the contents of the buffer are unchanged (the write doesn’t occur).
Figure 17-31: Stop Condition Receive or Transmit Mode
BRG
SCL
SDA
(baud rate generator rollover count) later, the SDA pin will be de-asserted. When the SDA
Write to SSPCON2
Falling edge of
9th clock
Note: T
ACK
Set PEN
BRG
= one baud rate generator period.
SDA asserted low before rising edge of clock
to setup stop condition.
Preliminary
T
T
BRG
BRG
(Figure
T
SCL brought high after T
BRG
17-31).
SCL = 1 for T
after SDA sampled high. P bit (SSPSTAT<4>) is set
P
T
BRG
BRG
PEN bit (SSPCON2<2>) is cleared by
hardware and the SSPIF bit is set
, followed by SDA = 1 for T
BRG
1997 Microchip Technology Inc.
BRG
later, the PEN bit
BRG