
FUJITSU LIMITED
PRELIMINARY and CONFIDENTIAL
MB86277 MINT
Graphics Controller
220
Specifications Rev. 1.0
BCR (Bus
BCR (Bus Control
Control
Control Register)
Register)
Register
address
I2C Base Address + 0004h
Bit No
7
6
5
4
3
2
1
0
Bit field name
BER
BEIE
SCC
MSS
ACK
GCAA
INTE
INT
R/W
R/W0
R/W
R0/W1
R/W
Default
0
Bit7
BER (Bus Error)
Flag bit for request of bus error interruption
When this bit is set, EN bit on CCR register will be cleared, this module will be in a
stop state and data transfer will be discontinued.
write case
0: A request of buss error interruption is cleared.
1: Don’t care.
read case
0: A bus error was not detected.
1: Undefined START condition or STOP condition was detected while data transfer.
Bit6
BEIE (Bus Error Interruption Enable)
Permit bus error interruption
When both this bit and BER bit are “1”, the interruption is generated.
0: Prohibition of bus error interruption
1: Permission of bus error interruption
Bit5
SCC (Start Condition Continue)
Generate START condition
write case
0: Don’t care.
1: START condition is generated again at the time of master transmission.
Bit4
MSS (Master Slave Select)
Select master / slave mode
When arbitration lost is generated in master transmission, this bit is cleared and
this module becomes a slave mode.
0: This module becomes a slave mode after generating STOP condition and
completing transfer.
1: This module becomes a master mode, generates START condition and starts
transfer.
Bit3
ACK (ACKnowledge)
Permit generation of acknowledge at the time of data reception
This bit becomes invalid at the time of address data reception in a slave mode.
0: Acknowledge is not generated.
1: Acknowledge is generated.
Bit2
GCAA(General Call Address Acknowledge)
Permit generation of acknowledge at the time of general call address reception
0: Acknowledge is not generated.
1: Acknowledge is generated.
Bit1
INTE (INTerrupt Enable)
Permit interruption
When this bit is “1” interruption is generated if INT bit is “1”.
0: Prohibition of interrupt
1: Permission of interrupt
Bit0
INT (INTrrupt)
Flag bit for request of interruption for transfer end
When this bit is “1” SCL line is maintained at “L” level. If this bit is cleared by being
written “0”, SCL line is released and the following byte transfer is started. Moreover,
it is reset to “0” by generating of START condition or STOP condition at the time of a
master.
write case
0: The flag is cleared.
1: Don’t care.