Panasonic F77G, MN101C77C user manual Operation, CK0MD, CK1MD, CK4MD, CK5MD

Chapter 5 Prescaler

5-3 Operation

5-3-1 Operation

„Prescaler Operation (Prescaler 0 to 1)

Prescaler 0 is a 7-bit and prescaler 1 is a 3-bit free-running counter that divides the base clock. This prescaler can be started or stopped by the PSCEN flag of the prescaler control register (PSCMD).

„Count Timing of Prescaler Operation (Prescaler 0 and 1) Prescaler 0 counts up at the falling edge of fosc. Prescaler 1 counts up at the falling edge of fs.

„Peripheral Functions with Prescaler Output Cycle Clock

Table 5-3-1 shows the prescaler output clock source that the peripheral functions can be used, and the registers that control the clock source selection.

Table 5-3-1 Peripheral Functions Used with Prescaler Output Cycle Clock

	Peripheral functions	Control register
External interrupt 0	Noise filter sampling clock	-
External interrupt 1	Noise filter sampling clock	-
Timer 0	Count clock	CK0MD
Timer 1	Count clock	CK1MD
Timer 4	Count clock	CK4MD
Timer 5	Count clock	CK5MD
Serial 0	Transfer clock	SC0CKS
Serial 1	Transfer clock	SC1CKS
Serial 3	Transfer clock	SC3CKS

When the prescaler output clock source is used, counting of prescaler should be enabled before starting the peripheral functions.

Operation V - 11