MAX7348AEP-T Maxim Integrated, MAX7348AEP-T Datasheet - Page 20

• Manufacturer Part Number: MAX7348AEP-T
• Description: Peripheral Drivers & Components - PCIs Low-EMI Key Switch & Sounder Controller
• Manufacturer: Maxim Integrated

2-Wire Interfaced Low-EMI Key Switch
and Sounder Controllers
Table 13. Ports Register Format (continued)
Table 14. Key-Sound Register Format
20
This-8 bit value is passed to sounder controller when key(s)
debounced, if enabled in the configuration register; these 7
bits define duration and frequency only; sounder command
bit D0 is ignored and fixed internally at 1; if a key sound is
sent as 000xxxxx (continuous), then the command is stored
as 111xxxxx (1000 ms)
Power-up default setting
Clear port 7 low
Set port 7 high (high
impedance)
Clear INT port low;
this setting is ignored
unless the key-scan INT
functionality is disabled
by setting interrupt
register bits D4 to D0 to
00000
Set INT port high (high
impedance); this setting
is ignored unless the
key-scan INT
functionality is disabled
by setting interrupt
register bits D4 to D0 to
00000
Alert input level is low
Alert input level is high
Power-up default
setting
PORTS REGISTER
______________________________________________________________________________________
REGISTER
REGISTER
CODE (hex)
ADDRESS
0x05
0x05
0x05
0x05
0x05
0x05
0x05
0x05
WRITE
WRITE
READ
READ
Read
Read
Write
Write
Write
Write
—
PORT 7 PORT 6 PORT 5 PORT 4 PORT 3 PORT 2
PORT 7 PORT 6 PORT 5 PORT 4 PORT 3 PORT 2
D7
X
X
X
X
0
1
1
CODE (hex)
ADDRESS
D6
X
X
X
X
X
X
1
0x06
0x06
D5
X
X
X
X
X
X
1
D7
0
7-bit value (see Table 16 for functionality)
REGISTER DATA
D4
D6
X
X
X
X
X
X
1
1
D5
0
REGISTER DATA
D3
X
X
X
X
X
X
1
D4
1
D2
X
X
X
X
X
X
1
D3
0
D2
PORT
PORT
0
INT
INT
D1
X
X
X
X
0
1
1
D1
0
ALERT
INPUT
D0
X
X
X
X
X
X
0
1
D0
1
1