AT89C51ED2-RDTIM datasheet(63/137 Pages) ATMEL

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AT89C51RD2/ED2

4235E–8051–04/04

Table 45. KBLS Register

KBLS-Keyboard Level Selector Register (9Ch)

Reset Value = 0000 0000b

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.

AT89C51ED2-RDTIM 数据表(PDF) 63 Page - ATMEL Corporation

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