186 User’s Manual U11302EJ4V0UMCHAPTER 11 BUZZER OUTPUT CONTROLLER11.1 Buzzer Output Controller FunctionsThe buzzer output controller outputs a 1.2 kHz, 2.4 kHz, or 4.9 kHz frequency square-wave. The buzzerfrequency selected by timer clock select register 2 (TCL2) is output from the BUZ/P36 pin.Follow the procedure below to output the buzzer frequency.[1] Select the buzzer output frequency using bits 5 to 7 (TCL25 to TCL27) of TCL2.[2] Set the P36 output latch to 0.[3] Set bit 6 (PM36) of port mode register 3 (PM3) to 0 (set to output mode).Caution Buzzer output cannot be used when the P36 output latch is set to 1.11.2 Buzzer Output Controller ConfigurationThe buzzer output controller consists of the following hardware.Table 11-1. Buzzer Output Controller ConfigurationItem ConfigurationControl registers Timer clock select register 2 (TCL2)Port mode register 3 (PM3)Figure 11-1. Buzzer Output Controller Block DiagramfX/210fX/211fX/212P36outputlatch3BUZ/P36PM36TCL27TCL26TCL25Internal busTimer clock selectregister 2 Port mode register 3Selector
