Rainbow Electronics W79E8213R - Manual (Page 76)

Preliminary W79E8213/W79E8213R Data Sheet
Publication Release Date: July 11, 2008
- 76 - Revision A2
20. BUZZER OUTPUT
The W79E8213 series support square wave output capability. The square wave is output through P1.0
(BUZ) pin. The square wave can be enabled through bit BUZE (SFR AUXR1.1). Depending on Fcpu
clock input to the buzzer output block, user is able to control the output frequency by configure the 6-
bit Divider through BUZDIV bits in BUZCON SFR. The following shows the block diagram of square
wave output generator.
Figure 20-1: Square wave output
Buzzer output frequency equation:
Fbuz = Fcpu x 1/[256x(BUZDIV+1)]
The following table tabulates examples of the BUZDIV setting needed in order to generate buzzer
output at rate of 1953Hz and 3906Hz, for each cpu clock frequency.