Panasonic MN101C77C, F77G user manual Operation, Synchronous Output Event

Chapter 4 I/O Ports

4-11-3 Operation

„Synchronous Output Setup

The synchronous output control register (P6SYO) selects the synchronous output pin of the port 6, in each bit.

The synchronous output event is selected by the pin control register (FLOAT).

Table 4-11-2 Synchronous Output Event

		Page
Synchronous output port	Port 6	IV - 26
	External interrupt 2	III - 19, 49
	(IRQ2)	VI - 33
Output event
	Timer 1	VI - 33
	Timer 5	VI - 33
	Timer7	VII - 31

When the external interrupt 2 (IRQ2) is selected, the interrupt edge should be specified. The interrupt edge can be specified by the external interrupt 2 control register (IRQ2ICR) or the both edges interrupt control register (EDGDT). The synchronous output recognizes the generation of the specified edge as an event.

„Synchronous Output Operation

When the synchronous output control register (P6SYO) is set to disable the synchronous output (I/O port), the port 6 is functioned as a general port. When the port 6 is set to disable the synchronous output, the same value to the port 6 output register (P6OUT) is always loaded to the synchronous output value stored register. (Figure 4-11-1. Block Diagram)

After the output mode is selected by the port 6 direction control register (P6DIR), if the synchronous output is enabled by the synchronous output control register (P6SYO), the value of the synchronous output value stored register is output from pins. If the synchronous output event that is set by the pin control register (FLOAT) is never generated, the synchronous output value stored register holds the same value when the synchronous output event is enabled.

Store the value that should be output from pin after the synchronous output event is generated, to the port 6 output register (P6OUT). Once the synchronous output event that is set by the pin control register (FLOAT) is generated, the data of the synchronous output value stored register is switched to the data of the port 6 output register (P6OUT), and the output value from pin is changed.

Before the synchronous output is enabled by the synchronous output control register (P6SYO), set the initial value of the synchronous output to the port 7 output register (P6OUT), in advance.

IV - 50 Synchronous Output (Port 7)