M37221M4H_15 Datasheet, PDF (100/114 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

M37221M4H/M6H/M8H/MAH–XXXSP/FP M37221EASP/FP
Address 00D916
I²C Status Register
b7 b6 b5 b4 b3 b2 b1 b0
I²C status register (S1) [Address 00D916]
B
Name
Functions
After reset R W
0 Last receive bit (LRB)
(See note)
0 : Last bit = “0 ”
1 : Last bit = “1 ”
Indeterminate _{R —}
(See note)
1 General call detecting flag 0 : No general call detected
0 _R—
(AD0) (See note)
1 : General call detected _{(See note)}
2 Slave address comparison 0 : Address mismatch
0 _R—
flag (AAS) (See note)
1 : Address match
(See note)
3 Arbitration lost detecting flag 0 : Not detected
(AL) (See note)
1 : Detected
0 _R—
(See note)
4 I2C-BUS interface interrupt
request bit (PIN)
0 : Interrupt request issued
1 : No interrupt request issued
1 _RW
5 Bus busy flag (BB)
0 : Bus free
1 : Bus busy
0 _RW
6, 7 Communication mode
specification bits
(TRX, MST)
b7 b6
0 0 : Slave recieve mode
0 1 : Slave transmit mode
1 0 : Master recieve mode
1 1 : Master transmit mode
0 _RW
Note : These bits and flags can be read out, but cannnot be written.
Address 00DA16
I²C Control Register
b7 b6 b5 b4 b3 b2 b1 b0
I²C control register (S1D) [Address 00DA16]
B
Name
Functions
0 Bit counter
to (Number of transmit/recieve
2 bits)
(BC0 to BC2)
b2 b1 b0
0 0 0: 8
0 0 1: 7
0 1 0: 6
0 1 1: 5
1 0 0: 4
1 0 1: 3
1 1 0: 2
1 1 1: 1
After reset R W
0 _RW
3 _I2C-BUS interface use
enable bit (ESO)
0: Disabled
1: Enabled
4 Data format selection
bit(ALS)
0: Addressing format
1: Free data format
5 Addressing format selection 0: 7-bit addressing format
bit (10BIT SAD)
1: 10-bit addressing format
6, 7 Connection control bits
between I²C-BUS interface
and ports
(BSEL0, BSEL1)
b7 b6 Connection port (See note)
0 0: None
0 1: SCL1, SDA1
1 0: SCL2, SDA2
1 1: SCL1, SDA1, SCL2, SDA2
0 _RW
0 _RW
0 _RW
0 _RW
Rev.1.00 Oct 01, 2002 page 98 of 110
REJ03B0134-0100Z