Configuration; Control; Software Reset - Philips CEM2100/00 Service Manual

16. Serial Bus Interface(I
The T5CL8 has a serial bus interface which employs an I
The serial interface is connected to an external devices through SDA and SCL.
The serial bus interface pins are also used as the port. When used as serial bus interface pins, set the output latches
of these pins to "1". When not used as serial bus interface pins, the port is used as a normal I/O port.
Note 1: The serial bus interface can be used only in NORMAL1/2 and IDLE1/2 mode. It can not be used in IDLE0,
SLOW1/2 and SLEEP0/1/2 mode.
Note 2: The serial bus interface can be used only in the Standard mode of I
can not be used.
Note 3: Please refer to the I/O port section about the detail of setting port.

16.1 Configuration

fc/4 Divider
I C bus
2
Noise
clock sysn.
canceller

Control

SBICRB/
SBISRB
SBI control register B/
SBI status register B
16.2 Control
The following registers are used for control the serial bus interface and monitor the operation status.
• Serial bus interface control register A (SBICRA)
• Serial bus interface control register B (SBICRB)
• Serial bus interface data buffer register (SBIDBR)
2
• I C bus address register (I2CAR)
• Serial bus interface status register A (SBISRA)
• Serial bus interface status register B (SBISRB)

16.3 Software Reset

A serial bus interface circuit has a software reset function, when a serial bus interface circuit is locked by an exter-
nal noise, etc.
To reset the serial bus interface circuit, write "10", "01" into the SWRST (Bit1, 0 in SBICRB).
And a status of software reset canbe read from SWRMON (Bit0 in SBISRA).
2
C Bus) Ver.-D (SBI)
INTSBI interrupt request
Transfer
control
circuit
Shift
register
I2CAR SBIDBR
I 2 C bus SBI data
address register buffer register
Figure 16-1 Serial Bus Interface (SBI)
Page 195
2
C bus.
2
C. The fast mode and the high-speed mode
I C bus data
2
Noise
control
canceller
SBICRA/
SBISRA
SBI control register A/
SBI status register A
T5CL8
SCL
SCL
Input/
output
control
SDA
SDA