UPD70F3793GC-UEU-AX Datasheet, PDF (681/1113 Pages) Renesas Technology Corp – RENESAS MCU V850ES/Jx3-L Microcontrollers

V850ES/JG3-L
CHAPTER 19 I²C BUS
CHAPTER 19 I²C BUS
To use the I²C bus function, set the P38/SDA00, P39/SCL00, P40/SDA01, P41/SCL01, P90/SDA02, and
P91/SCL02 pins as the serial transmit/receive data I/O pins (SDA00 to SDA02) and serial clock I/O pins (SCL00
to SCL02), and set them to N-ch open-drain output.
19.1 Mode Switching of I²C Bus and Other Serial Interfaces
19.1.1 UARTA2 and I²C00 mode switching
In the V850ES/JG3-L, UARTA2 and I²C00 share pins and therefore cannot be used simultaneously.
operation mode to I²C00 in advance, using the PMC3 and PFC3 registers.
Set the
Caution The transmit/receive operation of UARTA2 and I²C00 is not guaranteed if these functions are
switched during transmission or reception. Be sure to disable the one that is not used.
Figure 19-1. Switching UARTA2 and I²C00 Mode
After reset: 0000H R/W Address: FFFFF446H, FFFFF447H
15
14
13
12
11
10
PMC3
0
0
0
0
0
0
9
8
PMC39 PMC38
0
0
PMC35 PMC34 PMC33 PMC32 PMC31 PMC30
After reset: 0000H R/W Address: FFFFF466H, FFFFF467H
15
14
13
12
11
10
PFC3
0
0
0
0
0
0
9
PFC39
8
PFC38
0
0
PFC35 PFC34 PFC33 PFC32 PFC31 PFC30
PMC3n
0
1
1
PFC3n
× Port I/O mode
0 UARTA2 mode
1
I²C00 mode
Operation mode
Remarks 1. n = 8, 9
2. × = don’t care
R01UH0165EJ0700 Rev.7.00
Sep 22, 2011
Page 681 of 1113