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Serial Interface
13-5
13.2.2 Block Diagram of General-Purpose Serial Interface
Fig 13-2-1 shows the block diagram for the general-purpose serial interface section.
Fig. 13-2-1 Block Diagram
Transmission buffer
Shift register
Reception buffer read
Transmission buffer write
Start bit detection
Parity bit check
Stop bit check
Start bit
Parity bit addition
Stop bit addition
Transfer
clock
control
IOCLK
Timer 3 underflow
Send break
Transfer clock
Reception buffer
Shift register
Interrupt request
generation
Transmission
interrupt request
Reception
interrupt request
Timer 9 underflow
Serial interface 0
Interrupt mode register
SC0ICR
SC0CTR
Control register
Status register
SC0STR
Transmission
bit counter
Reception bit
counter
SBI0
SBO0
Output control
I/O Port Block
Set the serial signals in
the I/O port control
register. However, some
pins may need to be set
as general-purpose
inputs, depending on the
transmission/reception
procedure.
Open-drain output
in I2C mode
Open-drain output
in I2C mode
SBT0
Output control