SNL320
16-Bit LCD Controller
5.1 Normal Mode
The normal mode means CPU main clock source is comes from 16MHZ Rosc or
crystal hi-speed clock source, so SNL320 is run in full speed. There are two pins option
“CKSEL” and “PLLEn” to select Rosc/crystal and enable/disable PLL circuit.
The detail setting of hi-speed clock is shown as following table.
CKSEL
0
0
1
1
PLLEn
Descriptions
0
16MHZ X’tal for hi-speed clock source
1
6MHZ X’tal and pumping to 16MHZ for hi-speed
clock source. (for USB application)
0
16MHZ Rosc for hi-speed clock source
1
reserved
5.2 Low-speed mode
This is a special operation mode of SNL320, the hi-speed clock is disable and main
clock of SNL320 is comes from low-speed clock source (32768HZ). It will save more
power consumption when chip works on this low-speed mode and this low-speed clock
can select 32768HZ crystal for clock source.
In additional, this low-speed clock also used to calibrate the hi-speed clock once the
high-speed clock source is comes from Rosc.
5.3 Stop Mode
In stop mode, all the system clocks are stop (16MZH & 32768HZ) and chip entry a very
low power consumption state. Chip will wake-up from stop mode once any IO state
change or external interrupt occurs.
5.4 Suspend Mode
In suspend mode, the hi-speed clock still working but chip is hold until any IO toggle or
external interrupt occurs. That means, the power consumption only come from
HXOSC circuit and LCD driver interface refresh circuit.
Ver: 1.2
8
July 22, 2005
SONIX [ SONIX TECHNOLOGY COMPANY ]
