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Rev. 1.10 12 May 16, 2011 Rev. 1.10 13 May 16, 2011
HT16K33
RAM Mapping 16*8 LED Controller Driver with keyscan
System Oscillator
●
The internal logic and the LED drive signals of the HT16K33 are timed by the integrated RC
oscillator.
●
The System Clock frequency determines the LED frame frequency. A clock signal must always be
supplied to the device; removing the clock may freeze the device if the standby mode command is
executed. At initial system power on, the System Oscillator is in the stop state.
Display Data Address Pointer
The addressing mechanism for the display RAM is implemented using the address pointer. This
allows the loading of an individual display data byte, or a series of display data bytes, into any
location of the display RAM. The sequence commences with the initialisation of the address pointer
by the address pointer command.
Key Data Address Pointer
The addressing mechanism for the key data RAM is implemented using the address pointer. This
allows the loading of an individual key data byte, or a series of key data bytes, into any location of
the key data RAM. The sequence commences with the initialisation of the address pointer by the
Address pointer command.
Register Information Address Pointer
The addressing mechanism for the register data and Interrupt ag information RAM is implemented
using the address pointer. This allows the loading of an individual register data and Interrupt ag
data byte, or a series of register data and Interrupt ag data bytes, into any location of the register
data and Interrupt ag information RAM. The sequence commences with the initialisation of the
address pointer by the Address pointer command.
Row Driver Outputs
The LED drive section includes 16 ROW outputs ROW0 to ROW15 which should be connected
directly to the LED panel. The Row output signals are generated in accordance with the multiplexed
column signals and with the data resident in the display latch. When less than 15 ROW outputs are
required the unused Row outputs should be left open-circuit.
Column Driver Outputs
The LED drive section includes eight column outputs COM0 to COM7 which should be connected
directly to the LED panel. The column output signals are generated in accordance with the selected
LE
D drive mode. When less than 8 column outputs are required the unused column outputs should
be left open-circuit.