Atmel C51 Arkusz Danych Pobierz pdf (Strona 67)

AT89C51RB2/RC2

4180E–8051–10/06

Table 53. KBLS Register

KBLS - Keyboard Level Selector Register (9Ch)

Reset Value = 0000 0000b

76543210

KBLS7 KBLS6 KBLS5 KBLS4 KBLS3 KBLS2 KBLS1 KBLS0

Bit

Number

Bit

Mnemonic Description

7KBLS7

Keyboard Line 7 Level Selection Bit

Cleared to enable a low level detection on Port line 7.

Set to enable a high level detection on Port line 7.

6KBLS6

Keyboard Line 6 Level Selection Bit

Cleared to enable a low level detection on Port line 6.

Set to enable a high level detection on Port line 6.

5KBLS5

Keyboard Line 5 Level Selection Bit

Cleared to enable a low level detection on Port line 5.

Set to enable a high level detection on Port line 5.

4KBLS4

Keyboard Line 4 Level Selection Bit

Cleared to enable a low level detection on Port line 4.

Set to enable a high level detection on Port line 4.

3KBLS3

Keyboard Line 3 Level Selection Bit

Cleared to enable a low level detection on Port line 3.

Set to enable a high level detection on Port line 3.

2KBLS2

Keyboard Line 2 Level Selection Bit

Cleared to enable a low level detection on Port line 2.

Set to enable a high level detection on Port line 2.

1KBLS1

Keyboard Line 1 Level Selection Bit

Cleared to enable a low level detection on Port line 1.

Set to enable a high level detection on Port line 1.

0KBLS0

Keyboard Line 0 Level Selection Bit

Cleared to enable a low level detection on Port line 0.

Set to enable a high level detection on Port line 0.

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 126 127

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