EM32117
16DIGITLCDDRIVERWITHCHECKTIMEFUNCTION
1
State>1
State=1
2
Stop watch
Mode
RTC 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".
HKS=Lo
1
HF
HKS=Hi
HF
On-hook state
HKS=Lo
2
4
On-hook
Hand-free state
Off-hook state
HKS=Hi
3
HF
HF
HF
HD
HD
HD
Off-Hook
Hand-free state
HD
6
HF
5
HD
HKS=Hi
ON-Hook
Hold-line state
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
ELAN [ ELAN MICROELECTRONICS CORP ]
