Datasheet

V850ES/JG3 CHAPTER 16 3-WIRE VARIABLE-LENGTH SERIAL I/O (CSIB)
R01UH0015EJ0300 Rev.3.00 Page 484 of 870
Sep 30, 2010
CHAPTER 16 3-WIRE VARIABLE-LENGTH SERIAL I/O (CSIB)
16.1 Mode Switching of CSIB and Other Serial Interfaces
16.1.1 CSIB4 and UARTA0 mode switching
In the V850ES/JG3, CSIB4 and UARTA0 are alternate functions of the same pin and therefore cannot be used
simultaneously. Set CSIB4, in advance, using the PMC3 and PFC3 registers, before use.
Caution The transmit/receive operation of CSIB4 and UARTA0 is not guaranteed if these functions are
switched during transmission or reception. Be sure to disable the one that is not used.
Figure 16-1. CSIB4 and UARTA0 Mode Switch Settings
PMC3
After reset: 0000H R/W Address: FFFFF446H, FFFFF447H
0 0 PMC35 PMC34 PMC33 PMC32 PMC31 PMC30
0 0 0 0 0 0 PMC39 PMC38
89101112131415
PFC3
After reset: 0000H R/W Address: FFFFF466H, FFFFF467H
0 0 0 0 0 0 PFC39 PFC38
0 0 PFC35 PFC34 PFC33 PFC32 PFC31 PFC30
89101112131415
PFCE3L
After reset: 00H R/W Address: FFFFF706H
0 0 0 0 0 PFCE32 0 0
Port I/O mode
ASCKA0 mode
SCKB4 mode
Port I/O mode
UARTA0 mode
CSIB4 mode
PMC32
0
1
1
PMC3n
0
1
1
Operation mode
Operation mode
PFCE32
×
0
0
PFC32
×
0
1
PFC3n
×
0
1
Remarks 1. n = 0, 1
2. × = don’t care