Panasonic MN101C77C User Manual

Chapter 4    I/O Ports

IV - 50

Synchronous Output (Port 7)

„

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).

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.

Page

Synchronous output port

Port 6

IV - 26

External interrupt 2 

III - 19, 49

(IRQ2)

VI - 33

Tim er 1

VI - 33

Tim er 5

VI - 33

Tim er7

VII - 31

Output event