HL14203 Ver la hoja de datos (PDF) - Hyundai Micro Electronics

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componentes Descripción

Fabricante

HL14203

LCD Driver IC

Hyundai Micro Electronics 

HL14203

Key input 1

Key input 2

Key Scan

800T

800T

800T

CE

Write

address

SI

SO

Write

address

Key data read request

Read

address

Write

address

Read

address

Read

address

Key data read

Key data read

Key data read request

Key data read

Key data read request

3) In sleep mode

• The pins KS1 to KS6 are set to high or low by the S0 and S1 bits in the

sleep mode control register.

• If a key on one of the lines corresponding to a KS1 to KS6 pin which is set

high is pressed, the oscillator on the OSC pin is started and a key scan is

performed. Keys are scanned until all keys are released. Multiple key pre-

sses are recognized by determining whether multiple key data bits are set.

• If a key is pressed for longer than 800T ( where T=1/fosc ) the HL14203

outputs a key data read request (a low level on SO) to the controller. The

controller acknowledges this request and reads the key data. However, if

CE is high during a serial data transfer, SO will be set high.

• After the controller reads the key data, the key data read request is cleared

( SO is set high ) and the HL14203 performs another key scan. However

this does not clear sleep mode. Also note that SO, being an open-drain

output, requires a pull-up resistor ( between 1 and 10 K).

• Sleep mode key scan example

Example : S0 = 0, S1 = 1 ( sleep with only KS6 high )

14

Preliminary

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