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User’s Manual U11969EJ3V0UM00
CHAPTER 8 SERIAL INTERFACE FUNCTION
8.3 Clocked Serial Interface 0 to 3 (CSI0 to CSI3)
8.3.1 Features
Number of channels: 4 channels (CSIn)
High transfer speed CSI0, CSI2, CSI3: 8.25 Mbps max. (
φ
/4 use,
φ
= 33 MHz)
CSI1: 2.00 Mbps max.
Half duplex communication
Character length: 8 bits
MSB first/LSB first selectable
External serial clock input/internal serial clock output selectable
3 wires: SOn
: serial data output
SIn
: serial data input
SCKn : serial clock I/O
Interrupt source: 4
• Transmission/reception completion interrupt (INTCSIn)
Remark
n = 0 to 3
φ
: Internal system clock
8.3.2 Configuration
CSIn is controlled by the clocked serial interface mode register (CSIMn). The transmit/receive data is read/written
from/to the serial I/O shift register (SIOn) (n = 0 to 3).
(1) Clocked serial interface mode registers (CSIM0 to CSIM3)
CSIMn are 8-bit registers that specify the operation of CSIn.
(2) Serial I/O shift registers (SIO0 to SIO3)
SIOn registers are 8-bit registers that convert serial data into parallel data, and vice versa. SIOn are used
for both transmission and reception.
Data is shifted in (received) or shifted out (transmitted) from the MSB or LSB side.
The actual transmitting and receiving of data is actually performed by writing data to and reading data from
the SIOn registers.
(3) Selector
Selects the serial clock to be used.
(4) Serial clock control circuit
Controls supply of the serial clock to the shift register. When the internal clock is used, it also controls the
clock output to the SCKn pin.
(5) Serial clock counter
Counts the serial clocks being output and the serial clocks received during transmission/reception to check
whether 8-bit data has been transmitted or received.
(6) Interrupt control circuit
Controls whether an interrupt request is generated when the serial clock counter has counted eight serial
clocks.
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