29-3
MB86R02 ‘Jade-D’ Hardware Manual V1.64
29.4 Block functions
The function of each block is described below.
Block
Description
Start condition/Stop
condition detector
Start condition and Stop condition are detected by the transition
state of the SDA and SCL lines.
Start condition/Stop
condition generator
The Start condition and Stop condition are generated by the
transition state of the SDA and SCL lines.
Arbitration lost detector
Output data to SDA line and input data from SDA line are compared
at data transmission.
If they do not match, arbitration is lost.
Shift clock generator
Timing count of serial data t transfer clock occurrence and output
control of SCL line clock are performed via the clock control register
setting.
Comparator
Compares the received address and self-address specified in the
address register or received address and global address.
I2CxADR
7 bit register that specifies the slave address.
I2CxDAR
8 bit register used for serial data transfer.
I2CxBSR
8 bit register with following functions to show I
2
C bus status and
others.
•
Repeated start condition detection
•
Arbitration lost detection
•
Acknowledge bit storage
•
Direction of data transfer
•
Addressing detection
•
General call address detection
•
First byte detection
I2CxBCR
8 bit register that performs I
2
C bus control and interrupt control has
following functions.
•
Interrupt request/permission
•
Start condition occurrence
•
Master/Slave selection
•
Acknowledge occurrence permission
I2CxCCR
7 bit register that sets clock frequency of serial data transfer.
•
Operation permission
•
Frequency setting of serial clock
•
Standard/High-speed mode selection
Noise filter
This noise filter is composed of a 3-stage shift register circuit.
If all 3 values consecutively sampled on the SCL/SDA lines are "1",
the filter output is a "1". If the values are all "0", the filter output is "0".
For other sampled values, the previous state 1 clock is maintained.
I2CxBC2R
This is the register to drive "L" forcibly and to confirm the line status
after the noise filter.
I2CxECSR
This is the register to enhance CS bit in I2CxCCR register.
I2CxBCFR
This is the register that specifies the frequency range of the bus
clock to be used.
Содержание MB86R02
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