PIC18F4220-I/P Microchip Technology Inc., PIC18F4220-I/P Datasheet - Page 195
PIC18F4220-I/P
Manufacturer Part Number
PIC18F4220-I/P
Description
Microcontroller; 4 KB Flash; 512 RAM; 256 EEPROM; 36 I/O; 40-Pin-PDIP
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F4220-IP.pdf
(388 pages)
Specifications of PIC18F4220-I/P
A/d Inputs
13-Channel, 10-Bit
Comparators
2
Cpu Speed
10 MIPS
Eeprom Memory
256 Bytes
Input Output
36
Interface
I2C/SPI/UART/USART
Memory Type
Flash
Number Of Bits
8
Package Type
40-pin PDIP
Programmable Memory
4K Bytes
Ram Size
512 Bytes
Speed
40 MHz
Timers
1-8-bit, 3-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Available stocks
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Manufacturer
Quantity
Price
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Part Number:
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Quantity:
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17.4.17.3
Bus collision occurs during a Stop condition if:
a)
b)
FIGURE 17-31:
FIGURE 17-32:
2003 Microchip Technology Inc.
After the SDA pin has been deasserted and
allowed to float high, SDA is sampled low after
the BRG has timed out.
After the SCL pin is deasserted, SCL is sampled
low before SDA goes high.
SSPIF
BCLIF
SDA
PEN
SDA
SCL
PEN
BCLIF
P
SSPIF
SCL
P
Bus Collision During a Stop
Condition
BUS COLLISION DURING A STOP CONDITION (CASE 1)
BUS COLLISION DURING A STOP CONDITION (CASE 2)
SDA asserted low
T
Assert SDA
BRG
T
BRG
PIC18F2220/2320/4220/4320
T
BRG
T
BRG
The Stop condition begins with SDA asserted low.
When SDA is sampled low, the SCL pin is allowed to
float. When the pin is sampled high (clock arbitration),
the Baud Rate Generator is loaded with SSPADD<6:0>
and counts down to 0. After the BRG times out, SDA is
sampled. If SDA is sampled low, a bus collision has
occurred. This is due to another master attempting to
drive a data ‘0’ (Figure 17-31). If the SCL pin is sam-
pled low before SDA is allowed to float high, a bus col-
lision occurs. This is another case of another master
attempting to drive a data ‘0’ (Figure 17-32).
SCL goes low before SDA goes high,
set BCLIF
T
BRG
T
BRG
SDA sampled
low after T
set BCLIF
DS39599C-page 193
‘0’
‘0’
‘0’
‘0’
BRG
,
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