Panasonic F77G Serial Interface Transfer Clock Output, Timer for Serial Interface Transfer Clock

Chapter 6 8-bit Timers

6-8 Serial Interface Transfer Clock Output

6-8-1 Operation

Serial interface transfer clock can be created by using the timer output signal.

„Serial InterfaceTransfer Clock Operation by 8-bit Timer (Timers 4 and 5)

Timer 4 output can be used as a transfer clock source for serial interface 1. Timer 5 output can be used as a transfer clock source for serial interface 0.

Table 6-8-1 Timer for Serial Interface Transfer Clock

Serial transfer clock	Timer 4	Timer 5
Serial interface 0	-	√
Serial interface 1	√	-
Serial interface 3	-	√

„Timing of Serial Interface Transfer Clock (Timers 4 and 5)

Count clock

TMnEN flag

Compare

register

N

Binary	00 01	N-1 N 00 01	N-1 N 00 01	N-1 N 00
counter

Interrupt request flag

Timer output

Serial transfer clock

Figure 6-8-1 Timing of Serial Interface Transfer Clock (Timers 4 and 5)

The timer output is synchronized to the serial transfer clock by the timer count clock, and its fre- quency is 1/2 of the set frequency by the compare register.

Other count timings are same to the timing of timer operation. For the baud rate calculation and the serial interface setup, refer to chapter 11. Serial Interface 0 and 1.

Serial Transfer Clock Output VI - 33