upd78f0148m1gka1-9eu Renesas Electronics Corporation., upd78f0148m1gka1-9eu Datasheet - Page 267

• Manufacturer Part Number: upd78f0148m1gka1-9eu
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

12.4 Clock Output/Buzzer Output Controller Operations
12.4.1 Clock output operation
12.4.2 Operation as buzzer output
The clock pulse is output as the following procedure.
<1> Select the clock pulse output frequency with bits 0 to 3 (CCS0 to CCS3) of the clock output selection register
<2> Set bit 4 (CLOE) of CKS to 1 to enable clock output.
Remark
The buzzer frequency is output as the following procedure.
<1> Select the buzzer output frequency with bits 5 and 6 (BCS0, BCS1) of the clock output selection register
<2> Set bit 7 (BZOE) of CKS to 1 to enable buzzer output.
(CKS) (clock pulse output in disabled status).
(CKS) (buzzer output in disabled status).
Clock output
The clock output controller is designed not to output pulses with a small width during output
enable/disable switching of the clock output. As shown in Figure 12-4, be sure to start output from the
low period of the clock (marked with * in the figure). When stopping output, do so after securing high
level of the clock.
CLOE
CHAPTER 12 CLOCK OUTPUT/BUZZER OUTPUT CONTROLLER
Figure 12-4. Remote Control Output Application Example
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User’s Manual U15947EJ3V1UD
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