P8XCL580HFT View Datasheet(PDF) - Philips Electronics
Part Name
Description
MFG CO.
'P8XCL580HFT' PDF : 80 Pages View PDF
Philips Semiconductors
Low voltage 8-bit microcontrollers with
UART, I2C-bus and ADC
Product specification
P80CL580; P83CL580
15 I2C-BUS SERIAL I/O
The serial port supports the twin line I2C-bus, which
consists of a serial data line (SDA) and a serial clock line
(SCL). These lines also function as the I/O port lines P1.7
and P1.6 respectively.
The system is unique because data transport, clock
generation, address recognition and bus control arbitration
are all controlled by hardware.
The I2C-bus serial I/O has complete autonomy in byte
handling and operates in 4 modes:
• Master transmitter
• Master receiver
• Slave transmitter
• Slave receiver.
These functions are controlled by the Serial Control
Register S1CON. S1STA is the Status Register whose
contents may also be used as a vector to various service
routines. S1DAT is the Data Shift Register and S1ADR is
the Slave Address Register. Slave address recognition is
performed by on-chip hardware.
Figure 17 is the block diagram of the I2C-bus serial I/O.
7
SLAVE ADDRESS
SDA
S1ADR
7
SHIFT REGISTER
ARBITRATION SYNC LOGIC
S1DAT
0
GC
0
SCL
BUS CLOCK GENERATOR
7
0
CONTROL REGISTER
S1CON
7
0
STATUS REGISTER
S1STA
MLB199
Fig.17 Block diagram of I2C-bus serial I/O.
1997 Mar 14
28
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