NEC PD78078 Manuale Utente

285

CHAPTER 13 CLOCK OUTPUT CONTROL CIRCUIT

13.3 Clock Output Function Control Registers

The following two types of registers are used to control the clock output function.

• Timer clock select register 0 (TCL0)

• Port mode register 3 (PM3)

(1) Timer clock select register 0 (TCL0)

This register sets PCL output clock.

TCL0 is set with a 1-bit or 8-bit memory manipulation instruction.

RESET input sets TCL0 to 00H.

Remark

Besides setting PCL output clock, TCL0 sets the 16-bit timer register count clock.