UPD705101 Datasheet, PDF (20/72 Pages) NEC – 32-BIT MICROPROCESSOR

µPD705101
9.2 Clocked Serial Interface (CSI)
The features of the clocked serial interface (CSI) are as follows:
• ^{High-speed transfer: 8.25 Mbps MAX. (bus clock: 33 MHz)}
• ^{Half duplex communication for transmission/reception (buffer is not provided)}
• ^{Character length: 8 bits}
• ^{External or internal clock selectable}
The configuration of the clocked serial interface (CSI) is shown below.
Figure 9-2. Block Diagram of CSI
Internal peripheral I/O bus
8
CSIM0 _{Mode register}
SI
8
Shift register
SIO0
SO latch
DQ
SO
SCLK
Serial clock control circuit
Serial clock counter
SEL
1/2
SEL
Interrupt control
circuit
Baud rate generator
1/2, 1/4, 1/8,
1/16, 1/32
φ
prescaler
INTCSI
Remark φ = bus clock (33 M to 16.7 MHz)
20