CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U13850EJ4V0UM
252
10.3 I
2
C Bus
To use the I
2
C bus function, set the P10/SDA0, P12/SCL0, P20/SDA1, and P22/SCL1 pins to N-ch open
drain output.
The products with an on-chip I
2
C bus are shown below.
• V850/SB1:
µ
PD703030AY, 703031AY, 703032AY, 703033AY, 70F3032AY, 70F3033AY
• V850/SB2:
µ
PD703034AY, 703035AY, 703036AY, 703037AY, 70F3035AY, 70F3037AY
The I
2
C0 and I
2
C1 have the following two modes.
• Operation stop mode
• I
2
C (Inter IC) bus mode (multimaster supported)
(1) Operation stop mode
This mode is used when serial transfers are not performed. It can therefore be used to reduce power
consumption.
(2) I
2
C bus mode (multimaster support)
This mode is used for 8-bit data transfers with several devices via two lines: a serial clock (SCLn) line and a
serial data bus (SDAn) line.
This mode complies with the I
2
C bus format and the master device can output “start condition”, “data”, and “stop
condition” data to the slave device, via the serial data bus. The slave device automatically detects these
received data by hardware. This function can simplify the part of application program that controls the I
2
C bus.
Since SCLn and SDAn are open drain outputs, the I
2
Cn requires pull-up resistors for the serial clock line and the
serial data bus line.
Remark
n = 0, 1
Содержание MPD703030A
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