EM32117Q Ver la hoja de datos (PDF) - ELAN Microelectronics

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EM32117Q

16 DIGIT LCD DRIVER WITH CHECK TIME FUNCTION

ELAN Microelectronics 

1

RTC Mode

EM32117

16 DIGIT LCD DRIVER WITH CHECK TIME FUNCTION

Preliminary

State>1

2

State=1

Stop watch

Mode

Figure 3 - Top Level Flow Chart

The system can be in one of the six states as defined by the following state diagram. The transitions between

states are driven by the level of HKS pins as well as Serial Data "Hand-Free" and "Hold".

HF

HF

1

On-hook state

HKS=Lo

HKS=Hi

4

On-hook

Hand-free state

HKS=Lo

2

Off-hook state

HKS=Hi

3

HF

HD HF

Off-Hook

HF

Hand-free state

HD HD

HD

6

ON-Hook

Hold-line state

HF

HD

HKS=Hi

5

Off-Hook

Hold-line state

HKS=Lo

Figure 4 - System State Diagram

RTC (Real time clock) Mode

When the system is in State 1 and RTC function is enabled (ENRTC pin at low level), the EM32117 will be

in Real-Time Clock display mode. There are two different RTC display formats available, e.g., 12 or 24 hours

format selected by 24/12 pin. When this pin is pulled "high", RTC will be displayed in 24 hour format. When

"low", RTC will be displayed in 12 hour format, as shown in the following:

12 hour format:

24 hour format:

* This specification are subject to be changed without notice.

3.17.1999 6

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