7220 Datasheet, PDF (253/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPENDIX
6.7 Control registers
I²C Status Register
b7 b6 b5 b4 b3 b2 b1 b0
I²C status register (S1) [Address 00D916]
B
Name
0 Last receive bit (LRB)
(See note)
Functions
0 : Last bit = “0 ”
1 : Last bit = “1 ”
1 General call detecting flag
(AD0) (See note)
0 : No general call detected
1 : General call detected
2 Slave address comparison 0 : Address mismatch
flag (AAS) (See note)
1 : Address match
3 Arbitration lost detecting flag
(AL) (See note)
4 I2C-BUS interface interrupt
request bit (PIN)
5 Bus busy flag (BB)
6, 7 Communication mode
specification bits
(TRX, MST)
0 : Not detected
1 : Detected
0 : Interrupt request issued
1 : No interrupt request issued
0 : Bus free
1 : Bus busy
b7 b6
0 0 : Slave recieve mode
0 1 : Slave transmit mode
1 0 : Master recieve mode
1 1 : Master transmit mode
Note : These bits and flags can be read out, but cannnot be written.
After reset R W
Indeterminate _{R —}
0 _R—
0 _R—
0 _R—
1 _RW
0 _RW
0 _RW
Fig. 6.7.9 I²C status register
Address 00D916
6-34
7220 Group User’s Manual