Configuration - NEC Renesas V850/SC1 User Manual

11.2.1 Configuration

CSIn includes the following hardware.
Item
Registers
Control registers
Remark n = 0, 2, 3
Figure 11-1. Block Diagram of 3-Wire Serial I/O (CSI0, CSI2, CSI3)
SIn
SOn
SCKn
Remarks 1. n = 0, 2, 3
2. TMx output is as shown below.
When n = 0, 3: TM5 output
When n = 2:
(1) Serial I/O shift register n (SIOn)
SIOn is an 8-bit register that performs parallel-serial conversion and serial transmission/reception (shift
operations) in synchronization with the serial clock.
SIOn is set by an 8-bit memory manipulation instruction.
When bit 7 (CSIEn) of serial operation mode register n (CSIMn) is set to 1, a serial operation can be started by
writing data to or reading data from SIOn.
When transmitting, data written to SIOn is output via the serial output (SOn).
When receiving, data is read from the serial input (SIn) and written to SIOn.
RESET input sets these registers to 00H.
Caution Do not access SIOn except by the transfer start trigger during a transfer operation (read is
disabled when MODEn = 0 and write is disabled when MODEn = 1).
Remark n = 0, 2, 3
CHAPTER 11 SERIAL INTERFACE FUNCTION
Table 11-1. Configuration of CSIn
Serial I/O shift register n (SIOn)
Serial operation mode register n (CSIMn)
Serial clock select register n (CSISn)
Internal bus
Serial clock counter
Serial clock controller
TM6 output
User's Manual U15109EJ3V0UD
Configuration
8
Serial I/O shift
register n (SIOn)
Interrupt
generator
Selector
INTCSIn
TMx output
Clock selection
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