Epson S1C63558 4.12.7 I/O memory of sound generator, Table, Control bits of sound generator, R00, R01: R00, R01 output port data register (FF31H• D0, D1)

CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Sound Generator)

4.12.7 I/O memory of sound generator

Table 4.12.7.1 shows the I/O addresses and the control bits for the sound generator.

Table 4.12.7.1

Control bits of sound generator

Address

Register

Comment

D3

D2

D1

D0

Name

Init ∗ 1

1

0

R03HIZ

R02HIZ

R01HIZ

R00HIZ

R03HIZ

0

Hi-Z

Output

R03 (FOUTE=0)/FOUT (FOUTE=1) Hi-z control

FF30H

R02HIZ

0

Hi-Z

Output

R02 (PTOUT=0)/TOUT (PTOUT=1) Hi-z control

R/W

R01HIZ

0

Hi-Z

Output

R01 (BZOUT=0)/BZ (BZOUT=1) Hi-z control

R00HIZ

0

Hi-Z

Output

R00 (XBZOUT=0)/XBZ (XBZOUT=1) Hi-z control

R03

R02

R01

R00

R03

1

High

Low

R03 output port data (FOUTE=0) Fix at "1" when FOUT is used.

FF31H

(FOUT)

(TOUT)

(BZ)

(XBZ)

R02

1

High

Low

R02 output port data (PTOUT=0) Fix at "1" when TOUT is used.

R/W

R01

1

High

Low

R01 output port data (BZOUT=0) Fix at "1" when BZ is used.

R00

1

High

Low

R00 output port data (XBZOUT=0) Fix at "1" when XBZ is used.

0

0

BZOUT

XBZOUT

0 ∗ 3

– ∗ 2

Unused

0 ∗ 3

– ∗ 2

Unused

FF65H

R

R/W

BZOUT

0

BZ

DC

R01 output selection (R01 should be fixed at "1".)

XBZOUT

0

XBZ

DC

R00 output selection (R00 should be fixed at "1".)

ENRTM

ENRST

ENON

BZE

ENRTM

0

1sec

0.5sec

Envelope releasing time selection

ENRST∗ 3

Reset

Reset

Invalid

Envelope reset (writing)

FF6CH

R/W

W

R/W

ENON

0

On

Off

Envelope On/Off

BZE

0

Enable

Disable

Buzzer output enable

0

BZSTP

BZSHT

SHTPW

0 ∗ 3

– ∗ 2

Unused

BZSTP∗ 3

0

Stop

Invalid

1-shot buzzer stop (writing)

FF6DH

BZSHT

0

Trigger

Invalid

1-shot buzzer trigger (writing)

R

W

R/W

Busy

Ready

1-shot buzzer status (reading)

SHTPW

0

125msec

31.25msec

1-shot buzzer pulse width setting

0

BZFQ2

BZFQ1

BZFQ0

0 ∗ 3

– ∗ 2

Unused

[BZFQ2, 1, 0]

0

1

2

3

BZFQ2

0

Buzzer

FF6EH

Frequency (Hz) 4096.0

3276.8

2730.7

2340.6

BZFQ1

0

frequency

R

R/W

[BZFQ2, 1, 0]

4

5

6

7

BZFQ0

0

selection

Frequency (Hz) 2048.0

1638.4

1365.3

1170.3

0

BDTY2

BDTY1

BDTY0

0 ∗ 3

– ∗ 2

Unused

FF6FH

BDTY2

0

Buzzer signal duty ratio selection

BDTY1

0

R

R/W

(refer to main manual)

BDTY0

0

*1 Initial value at initial reset

*2 Not set in the circuit

*3 Constantly "0" when being read

R00HIZ, R01HIZ: R00, R01 port high impedance control register (FF30H•D0, D1)

Controls high impedance output of the output port.

When "1" is written: High impedance

When "0" is written: Data output

Reading: Valid

When using the BZ and XBZ outputs, fix the registers at "0". R01HIZ corresponds to the BZ output and R00HIZ corresponds to the XBZ output.

At initial reset, these registers are set to "0".

R00, R01: R00, R01 output port data register (FF31H• D0, D1)

Set the output data for the output ports.

When "1" is written: High level output

When "0" is written: Low level output

Reading: Valid

When using the BZ and XBZ outputs, fix the registers at "1". R01 corresponds to the BZ output and R00 corresponds to the XBZ output.

At initial reset, these registers are all set to "1".

S1C63558 TECHNICAL MANUAL EPSON 105