NEC NEC PD78081(A), User Manual

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CHAPTER 9 BUZZER OUTPUT CONTROL CIRCUIT
9.3 Buzzer Output Function Control Registers
The following two types of registers are used to control the buzzer output function.
• Timer clock select register 2 (TCL2)
• Port mode register 3 (PM3)
(1) Timer clock select register 2 (TCL2)
This register sets the buzzer output frequency.
TCL2 is set with an 8-bit memory manipulation instruction.
RESET input sets TCL2 to 00H.
Remark Besides setting the buzzer output frequency, TCL2 sets the watchdog timer count clock.