Philips CEM2100/00 Service Manual page 320

16. Serial Bus Interface(I2C Bus) Ver.-D (SBI)
16.5 I2C Bus Control
2
I C bus Address Register
I2CAR
(0F92H)
SA
ALS
Note 1: I2CAR is write-only register, which cannot be used with any of read-modify-write instruction such as bit manipulation, etc.
Note 2: Do not set I2CAR to "00H" to avoid the incorrect response of acknowledgment in slave mode. ( If "00H" is set to I2CAR as
the Slave Address and a START Byte "01H" in I
Serial Bus Interface Control Register B
SBICRB
(0F93H)
MST
TRX
BB
PIN
SBIM
SWRST1
SWRST0
Note 1: Switch a mode to port after confirming that the bus is free.
Note 2: Switch a mode to I
Note 3: SBICRB has write-only register and must not be used with any of read-modify-write instructions such as bit manipulation,
etc.
Note 4: When the SWRST (Bit1, 0 in SBICRB) is written to "10", "01" in I
SBICRA, I2CAR, SBISRA and SBISRB registers are initialized and the bits of SBICRB except the SBIM (Bit3, 2 in SBI-
CRB) are also initialized.
Serial Bus Interface Status Register A
SBISRA
(0F90H)
SWRMON
Serial Bus Interface Status Register B
SBISRB
(0F93H)
7 6 5
Slave address
SA6 SA5 SA4
Slave address selection
Address recognition mode spec-
ification
7 6 5
MST TRX BB
Master/slave selection
Transmitter/receiver selection
Start/stop generation
Cancel interrupt service request
Serial bus interface operating
mode selection
Software reset start bit
2
C bus mode after confiming that the port is high level.
7 6 5
Software reset monitor
7 6 5
MST TRX BB
4 3 2
SA3 SA2 SA1
0: Slave address recognition
1: Non slave address recognition
2
C bus standard is recived, the device detects slave address match.)
4 3 2
PIN SBIM
0: Slave
1: Master
0: Receiver
1: Transmitter
0: Generate a stop condition when MST, TRX and PIN are "1"
1: Generate a start condition when MST, TRX and PIN are "1"
0: – (Can not clear this bit by a software)
1: Cancel interrupt service request
00: Port mode (Serial bus interface output disable)
01: Reserved
2
10:
I C bus mode
11: Reserved
Software reset starts by first writing "10" and next writing "01"
2
C bus mode, software reset is occurred. In this case, the
4 3 2
0: During software reset
1: – (Initial value)
4 3 2
PIN AL AAS
Page 198
T5CL8
1 0
(Initial value: 0000 0000)
ALS
SA0
1 0
SWRST1 SWRST0 (Initial value: 0001 0000)
1 0
SWRMON (Initial value: **** ***1)
1 0
AD0 LRB (Initial value: 0001 0000)
Write
only
Write
only
Read
only