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參數(shù)資料

型號：	MAX6954AAX
廠商：	MAXIM INTEGRATED PRODUCTS INC
元件分類：	顯示驅(qū)動器
英文描述：	Dual 4-Bit Decade And Binary Counters 20-LCCC -55 to 125
中文描述：	LED DISPLAY DRIVER, PDSO36
封裝：	SSOP-36
文件頁數(shù)：	15/38頁
文件大?。?/td>	395K
代理商：	MAX6954AAX

Port Configuration Register

The port configuration register selects how the five port

pins are used. The port configuration register format is

described in Table 32.

Key Mask Registers

The Key_A Mask, Key_B Mask, Key_C Mask, and

Key_D Mask write-only registers (Table 33) configure

the key-scanning circuit to cause an interrupt only when

selected (masked) keys have been debounced. Each

bit in the register corresponds to one key switch. The bit

is clear to disable interrupt for the switch, and set to

enable interrupt. Keys are always scanned (if enabled

through the port configuration register), regardless of

the setting of these interrupt bits, and the key status is

stored in the appropriate Key_x pressed register.

Key Debounced Registers

The Key_A debounced, Key_B debounced, Key_C

debounced, and Key_D debounced read-only registers

(Table 34) show which keys have been detected as

debounced by the key-scanning circuit.

Each bit in the register corresponds to one key switch.

The bit is set if the switch has been correctly

debounced since the register was read last. Reading a

debounced register clears that register (after the data

has been read) so that future keys pressed can be

identified. If the debounced registers are not read, the

key-scan data accumulates. However, as there is no

FIFO in the MAX6954, the user is not able to determine

key order, or whether a key has been pressed more

than once, unless the debounced key status registers

are read after each interrupt, and before the next key-

scan cycle.

Reading any of the four debounced registers clears the

IRQ output. If a key is pressed and held down, the key

is reported as debounced (and IRQ issued) only once.

The key must be detected as released by the key-scan-

ning circuit, before it debounces again. If the

debounced registers are being read in response to the

IRQ being asserted, then the user should generally read

all four registers to ensure that all the keys that were

detected by the key-scanning circuit are discovered.

Key Pressed Registers

The Key_A pressed, Key_B pressed, Key_C pressed,

and Key_D pressed read-only registers (Table 35)

show which keys have been detected as pressed by

the key-scanning circuit during the last test.

Each bit in the register corresponds to one key switch.

The bit is set if the switch has been detected as

pressed by the key-scanning circuit during the last test.

4-Wire Interfac ed, 2.7V to 5.5V LED Display

Driver with I/O Expander and K ey S c an

______________________________________________________________________________________

ADDRESS (COMMAND BYTE)

D13

D12

D15

D14

D11

D10

HEX CODE

Write Digit 2a Planes P0 and P1 with Same