Datasheet

V850ES/JG3 CHAPTER 16 3-WIRE VARIABLE-LENGTH SERIAL I/O (CSIB)
R01UH0015EJ0300 Rev.3.00 Page 485 of 870
Sep 30, 2010
16.1.2 CSIB0 and I
2
C01 mode switching
In the V850ES/JG3, CSIB0 and I
2
C01 are alternate functions of the same pin and therefore cannot be used
simultaneously. Set CSIB0 in advance, using the PMC4 and PFC4 registers, before use.
Caution The transmit/receive operation of CSIB0 and I
2
C01 is not guaranteed if these functions are switched
during transmission or reception. Be sure to disable the one that is not used.
Figure 16-2. CSIB0 and I
2
C01 Mode Switch Settings
Port I/O mode
CSIB0 mode
I
2
C01 mode
PMC4n
0
1
1
Operation mode
PFC4n
×
0
1
0PMC4 0 0 0 0 PMC42 PMC41 PMC40
After reset: 00H R/W Address: FFFFF448H
PFC4
After reset: 00H R/W Address: FFFFF468H
0 0 0 0 0 0 PFC41 PFC40
Remarks 1. n = 0, 1
2. × = don’t care
16.2 Features
Transfer rate: 8 Mbps (fXX = 32 MHz, using internal clock)
Master mode and slave mode selectable
8-bit to 16-bit transfer, 3-wire serial interface
Interrupt request signals (INTCBnT, INTCBnR) × 2
Serial clock and data phase switchable
Transfer data length selectable in 1-bit units between 8 and 16 bits
Transfer data MSB-first/LSB-first switchable
3-wire transfer SOBn: Serial data output
SIBn: Serial data input
SCKBn: Serial clock I/O
Transmission mode, reception mode, and transmission/reception mode specifiable
Remark n = 0 to 4