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CHAPTER 27 I
C INTERFACE (ONLY MB90485 SERIES)
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Pin related to I
C interface
The pin related to the I
output pin. The SCL/SDA pins function as the general-purpose I/O port (P76/SCL, P77/SDA)
2
and I
C interface. When using as the general-purpose I/O port, data is always enabled as port
because P76, P77 of the port direction register (DDR) do not exist (only MB90485 series). In
MB90485 series, the P76/SCL, P77/SDA pins are N-ch open-drain pin.
● Setting when using as SCL/SDA pin
When using as the I
Also, when using as the input port, the pull-up resistor must be added to the external pin.
■
Block diagram of pin related to I
Standby control : Stop mode (SPL =1), timebase timer mode (SPL =1), watch mode (SPL =1)
558
2
C interface has the SDA data input/output pin and SCL clock input/
2
C interface, the port data register should be set (PDR7 :bit14, 15 → "1").
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C interface
Figure 27.2-2 Block diagram of pin related to I
Peripheral function input
Port data register(PDR)
PDR Read
Output latch
PDR Write
Peripheral function output (SCL/SDA)
(SCL/SDA)
Peripheral function output enable
Standby control(SPL=1)
2
C interface
Pin
N-ch
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