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參數(shù)資料
| 型號： | TSC2300IPAGG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | GREEN, PLASTIC, TQFP-64 |
| 文件頁數(shù)： | 26/81頁 |
| 文件大小： | 1039K |
| 代理商： | TSC2300IPAGG4 |
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TSC2300
SLAS372 — NOVEMBER 2002
TSC2300 KEYPAD REGISTERS
The keypad scanner hardware in the TSC2300 is controlled by two registers: the keypad control register and the
keypad mask register. The keypad control register controls general keypad functions such as scanning and
de-bouncing, while the keypad mask register allows you to mask certain keys from being detected at all.
Keypad Control Register (Page 1, Address 01H)
The Keypad Control register is formatted as follows:
BIT 15 BIT 14 BIT 13 BIT 12 BIT 11 BIT 10
BIT 9
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
MSB
LSB
STC
SCS
DB2
DB1
DB0
X
Bit 15 — STC
Keypad Status. This bit reflects the operation of the KBIRQ pin, with inverted logic. This bit goes high when a key is
pressed and debounced. The default value for this bit is 0.
Table 21. STC Bit Operation
STC
VALUE
DESCRIPTION
0
No keys are pressed (default)
1
Key pressed and debounced
Bit 14 — SCS
Keypad Scan Status. When reading, this bit indicates if the scanner or de-bouncer is busy. Writing a 0 to this bit
causes keypad scans to continue until either the key is lifted or the process is stopped. Continuous scans can be
stopped by writing a 1 to this bit. This immediately halts a conversion (even if a key is still down). The default value for
this bit when read is 1.
Table 22. SCS Bit Operation
SCS
READ/WRITE
VALUE
DESCRIPTION
Read
0
Scanner or de-bouncer busy
Read
1
Scanner not busy (default)
Write
0
Normal operation
Write
1
Stop scans
Bits [13:11] — KBDB2-KBDB0
Keypad De-bounce Control. These bits set the length of the de-bounce time for the keypad, as shown in Table 23. The
default setting is a 2-mS de-bounce time (000).
Table 23. Keypad De-bounce Control
KBDB2
KBDB1
KBDB0
Function
0
De-bounce: 2 ms (default)
0
1
De-bounce: 10 ms
0
1
0
De-bounce: 20 ms
0
1
De-bounce: 50 ms
1
0
De-bounce: 60 ms
1
0
1
De-bounce: 80 ms
32
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