upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 221

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

10.1 Overview
10.2 3-Wire Serial I/O (CSI0 to CSI2)
(1) Operation stop mode
(2) 3-wire serial I/O mode (fixed to MSB first)
The V850/SA1 supports the following on-chip serial interfaces.
CSIn (n = 0 to 2) has the following two modes.
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•
•
•
Note I
This mode is used when serial transfers are not performed.
This is an 8-bit data transfer mode using three lines: a serial clock line (SCKn), serial output line (SOn), and serial
input line (SIn).
Since simultaneous transmit and receive operations are enabled in 3-wire serial I/O mode, the processing time for
data transfer is reduced.
The first bit in the 8-bit data in serial transfers is fixed to the MSB.
The SCKn and SOn pins are set to normal output or N-ch open-drain output by setting the port 1 function register
(PF1) and port 2 function register (PF2).
3-wire serial I/O mode is useful for connection to a peripheral I/O device that includes a clocked serial interface, a
display controller, etc.
Channel 0: 3-wire serial I/O (CSI0)/I
Channel 1: 3-wire serial I/O (CSI1)/Asynchronous serial interface (UART0)
Channel 2: 3-wire serial I/O (CSI2)
Channel 3: Asynchronous serial interface (UART1)
and 70F3017AY only).
Either 3-wire serial I/O or I
2
C supports multi-masters (
CHAPTER 10 SERIAL INTERFACE FUNCTION
2
C can be used as a serial interface.
µ
PD703014AY, 703014BY, 703015AY, 703015BY, 703017AY, 70F3015BY,
2
C bus interface (I
User’s Manual U12768EJ4V1UD
2
C)
Note
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