SIC63616-(Rev. 1.0) NO. P60
3240-0412
(3) Special output control
FOUT0–FOUT3: FOUT frequency select register (FF10H)
Selects the frequency of the FOUT signal and controls the FOUT output.
Table 4.5.8.3 FOUT clock frequency
FOUT3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
FOUT2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
FOUT1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
FOUT0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
FOUT frequency
f
OSC3
f
OSC3
/ 2
f
OSC3
/ 4
f
OSC3
/ 8
f
OSC3
/ 16
f
OSC3
/ 32
f
OSC3
/ 64
f
OSC3
/ 256
f
OSC1
(32 kHz)
f
OSC1
/ 2 (16 kHz)
f
OSC1
/ 4 (8 kHz)
f
OSC1
/ 16 (2 kHz)
f
OSC1
/ 32 (1 kHz)
f
OSC1
/ 64 (512 Hz)
f
OSC1
/ 256 (128 Hz)
Off
f
OSC1
: OSC1 oscillation frequency. ( ) indicates the clock frequency when fOSC1 = 32 kHz.
f
OSC3
: OSC3 oscillation frequency
Selecting an FOUT frequency (writing 1–15 to this register) outputs the FOUT signal from the P23 terminal.
Set FOUT0–FOUT3 to "0" to use P23 as a general-purpose DC input/output port.
At initial reset, these registers are set to "0".
BZE: Buzzer output control register (FF44H•D0)
Controls the buzzer signal output.
When "1" is written: Buzzer output On
When "0" is written: Buzzer output Off
Reading: Valid
When "1" is written to BZE, the BZ signal is output from the P03 terminal. When "0" is written, P03 is used
as a general-purpose DC input/output port.
At initial reset, this register is set to "0".
BZSHT: One-shot buzzer trigger/status (FF45H•D1)
Controls the one-shot buzzer output.
• When writing
When "1" is written: Trigger
When "0" is written: No operation
Writing "1" into BZSHT causes the one-short output circuit to operate and a buzzer signal to be output from
the P03 terminal. This output is automatically turned off after the time set by SHTPW has elapsed. The one-
shot output is only valid when the normal buzzer output is off (BZE = "0") and will be invalid when the
normal buzzer output is on (BZE = "1"). When a re-trigger is assigned during a one-shot output, the one-
shot output time set with SHTPW is measured again from that point (time extension).
• When reading
When "1" is read:
BUSY
When "0" is read:
READY
During reading BZSHT shows the operation status of the one-shot output circuit. During one-shot output,
BZSHT becomes "1" and the output goes off, it shifts to "0".
At initial reset, this register is set to "0".
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