Operations of Port 6 Functions | Fujitsu F202RA, MB89202 instruction

CHAPTER 4 I/O PORTS

4.6.2Operations of Port 6 Functions

This section describes the operation of port 6.

■Operation of Port 6

●Operation in output port mode

When "1" is written for a bit of the DDR6 register, the bit corresponding to a pin of port 6, the pin functions as an output port.

In output port mode, the output transistor operation is enabled and the output latch data is output to the pin.

Once data has been written into the PDR6 register, the written data is held in the output latch and output to the pin as it is.

The value state of the pin can be read by reading the PDR6 register.

●Operation in input port mode

When "0" is written for a bit of the DDR6 register, the bit corresponding to a pin of port 6, the pin functions as an input port.

In input port mode, the output transistor is OFF and the pin status is Hi-Z.

Once data has been written into the PDR6 register, the written data is held in the output latch but is not output to the pin.

The value state of the pin can be read by reading the PDR6 register.

●Operation when a reset is performed

When the CPU is reset, the bits of the DDR6 register are initialized to "0". Thus, all output transistors become OFF and the pins become Hi-Z.

However, CPU resets do not initialize the PDR6 register. If a pin is used as an output port after the reset, reinitialize the PDR6 register to contain new output data in the bit position corresponding to the pin and then set the corresponding bit of the DDR6 register so that the pin will function as an output port.

●Operation in stop mode

When the pin state setting bit of the standby control register (STBC: SPL) is "1" and when the stop mode is entered, the output transistor is turned OFF and the pin becomes Hi-Z because the output transistor is forcibly turned OFF without respect to the value existing on the DDR6 register in the bit position corresponding to the pin.

Input remains fixed to prevent leaks by input open.

Table 4.6-4summarizes the operating modes of the pins of port 6.

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F202RA, MB89202 specifications

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Fujitsu F202RA, MB89202 manual Operations of Port 6 Functions, Operation in output port mode

Models: F202RA MB89202