upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 222

• Manufacturer Part Number: upd70f3017ay
• Description: V850/sa1tm 32-/16-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

10.2.1 Configuration
(1) Serial I/O shift registers 0 to 2 (SIO0 to SIO2)
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CSIn consists of the following hardware.
SIOn is an 8-bit register that performs parallel-serial conversion and serial transmission/reception (shift
operations) synchronized with the serial clock.
SIOn is set by an 8-bit memory manipulation instruction.
When “1” is set to bit 7 (CSIEn) of serial operation mode register n (CSIMn), 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 resets these registers to 00H.
SCKn
Caution Do not execute SIOn accesses except for accesses that become the transfer start trigger
SOn
Remarks 1. n = 0 to 2
Remark n = 0 to 2
SIn
Registers
Control registers
during a transfer operation (read is disabled when MODEn = 0 and write is disabled when
MODEn = 1).
2. TMx output is as follows:
When n = 0:
When n = 1, 2: TM3
Item
Figure 10-1. Block Diagram of 3-Wire Serial I/O
CHAPTER 10 SERIAL INTERFACE FUNCTION
TM2
Table 10-1. Configuration of CSIn
Serial I/O shift registers 0 to 2 (SIO0 to SIO2)
Serial clock select registers 0 to 2 (CSIS0 to CSIS2)
Serial operation mode registers 0 to 2 (CSIM0 to CSIM2)
User’s Manual U12768EJ4V1UD
Internal bus
Serial clock controller
Serial clock counter
Configuration
register n (SIOn)
Serial I/O shift
8
Interrupt
generator
Selector
TMx output
Clock selection
INTCSIn