PD178004A_15 Datasheet, PDF (20/58 Pages) Renesas Technology Corp – PD178004A_15

µPD178004A, 178006A, 178016A, 178018A
Figure 5-5. Watchdog Timer Block Diagram
f xx
2³
Prescaler
f xx
f xx
f xx
f xx
f xx
f xx
f xx
2⁴
2⁵
2⁶
2⁷
2⁸
2⁹
2 ¹¹
Selector
8-Bit Counter
Control
Circuit
INTWDT
Maskable
Interrupt Request
Reset
INTWDT
Non-Maskable
Interrupt Request
5.4 BUZZER OUTPUT CONTROL CIRCUIT
The clock with the following frequency can be output as a buzzer output.
• 1.5 kHz/3 kHz/6 kHz (@ 4.5-MHz crystal oscillator with system clock)
Figure 5-6. Buzzer Output Control Circuit Block Diagram
1.5 kHz
3 kHz
6 kHz
3
BEEP/ P36
TCL27 TCL26 TCL25
Timer Clock Select Register 2
P36
Output Latch
Internal Bus
PM36
Port Mode Register 3
18