Fujitsu 8FX User Manual

MB95630H Series
MN702-00009-2v0-E FUJITSU SEMICONDUCTOR LIMITED 521
CHAPTER 24 I
2
C BUS INTERFACE
24.7 Registers
24.7.3 I
2
C Bus Status Register ch. n (IBSRn)
The I
2
C bus status register ch. n (IBSRn) indicates the status of the I
2
C bus
interface.
■ Register Configuration
■ Register Functions
[bit7] BB: Bus busy bit
This bit indicates the bus state.
[bit6] RSC: Repeated START condition detection bit
This bit detects the repeated START condition.
This bit is set to "1" when a repeated START condition is detected.
If one of the following conditions is satisfied, this bit is set to "0".
• "0" is written to the IBCR1n:INT bit.
• In slave mode, the slave address does not match the address set in the IAARn register.
• In slave mode, the slave address matches the address set in the IAARn register but the IBCR0n:AACKX bit
is set to "1".
• In slave mode, the device receives a general call address, but the IBCR1n:GACKE bit is set to "0".
• A STOP condition is detected.
[bit5] Undefined bit
The read value of this bit is always "0". Writing a value to this bit has no effect on operation.
bit 7 6 5 4 3 2 1 0
Field BB RSC — LRB TRX AAS GCA FBT
Attribute R R — R R R R R
Initial value 0 0 0 0 0 0 0 0
bit7 Details
Reading "0" Indicates that a STOP condition has been detected and the bus has entered the idle state.
Reading "1" Indicates that a START condition has been detected and the bus has entered the busy state.
bit6 Details
Reading "0" Indicates that no repeated START condition has been detected.
Reading "1" Indicates that the bus is in use and a repeated START condition has been detected.

Fujitsu 8FX Specifications

General

Brand	Fujitsu
Model	8FX
Category	Computer Hardware
Language	English