Table of Contents
Advertisement
Since the FOUT signal is generated asynchronously
from the register FOUTON, when the signal is
turned ON or OFF by the register settings, a hazard
of a 1/2 cycle or less is generated.
Figure 5.5.5.4 shows the output waveform of the
FOUT signal.
FOUTON
0
FOUT output (R34)
Fig. 5.5.5.4 Output waveform of FOUT signal
BZ output (R50), BZ output (R51)
In order for the E0C88832/88862 to drive an
external buzzer, a BZ signal (sound generator
output) can be output from the output port
terminal R50. Furthermore, the R51 output port
terminal can be used to output a BZ signal (BZ
inverted signal).
The configuration of the output ports R50 and R51
is shown in Figure 5.5.5.5.
Register R50D
BZ signal
Register BZSHT
S
Q
Register BZSTP
One-shot
R
time up
Register BZON
Register R51D
Fig. 5.5.5.5 Configuration of R50 and R51
The output control for the BZ (BZ) signal is done by
the registers BZON, BZSHT and BZSTP. When you
set "1" for the BZON or BZSHT, the BZ (BZ) signal
is output from the output port terminal R50 (R51).
When "0" is set for the BZON or "1" is set for the
BZSTP, the R50 goes LOW (V
HIGH (V
).
DD
To output the BZ signal, "0" must always be set for
the data register R50D. The data register R51D does
not affect the BZ output.
The BZ (BZ) signal is generated by the sound
generator. With respect to control of frequency and
envelope, see "5.12 Sound Generator".
E0C88832/88862 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATIO (Output Ports)
1
R50 output
R51 output
Mask option
) and the R51 goes
SS
EPSON
Since the BZ (BZ) signal is generated asynchro-
nously from the registers BZON, BZSHT and
BZSTP, when the signal is turned ON or OFF by
setting the registers, a hazard of a 1/2 cycle or less
is generated.
Figure 5.5.5.6 shows the output waveform of the BZ
(BZ) signal.
BZON/BZSHT
0
BZ output (R50)
BZ output (R51) *
∗ when selected by mask option
Fig. 5.5.5.6 BZ (BZ) output waveform
1
41
Advertisement
Table of Contents
