NT6861U View Datasheet(PDF) - Novatek Microelectronics
Part Name
Description
Manufacturer
NT6861U Datasheet PDF : 44 Pages
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NT6861
11. I/O PORTs
NT6861 has 25 pins dedicated to input and output. These
pins are grouped into 4 ports .
11.1. Port0: P00 - P07
Port0 is an 8-bit bi-directional CMOS I/O port with PMOS
as internal pull-up (Figure 6). Each pin of Port0 may be bit
programmed as an input or output port without the
software controlling the data direction register. When Port0
works as output, the data to be output is latched to the port
data register and output to the pin. Port0 pins that have '1's
written to them are pulled high by the internal PMOS pull-
ups. In this state they can be used as input, then the input
signal can be read. This port outputs high after reset .
P00 - P05 are shared with DAC8 - DAC13 respectively. If
user sets ENDK8 - ENDK13 LOW in ENDAC register,
P00 - P05 will act as DAC8 - DAC13 respectively
(Figure 7). After the chip is reset, ENDK - ENDK13 will
enter HIGH state and P00 - P05s will act as I/O ports.
P06, P07 are shared with VSYNCO & HSYNCO
respectively. If user sets ENH , ENV to low in SYNCON
register, P06, P07 will act as VSYNCO & HSYNCO
respectively (Figure 8). After the chip is reset, ENH , ENV ,
will enter high state and P06, BP07 will act as I/O pins.
Addr. Register INIT
Bit7
$0000
PT0
FFH
P07
$000B SYNCON FFH NOHALF
$000C ENDAC FFH ENAD1
Bit6
P06
ENHALF
ENAD0
Bit5
Bit4
Bit3
Bit2
P05
P04
P03
P02
-
FRUN FRFREQ HALFPO
L
ENDK13 ENDK12 ENDK11 ENDK10
Bit1
P01
ENH
Bit0
P00 RW
ENV
W
ENDK9 ENDK8 W
Vcc
PWM
Data In
PWM
Output
Data Out
Figure 7. PWM Output Structure
I/O
Vcc
Data In
O/P
Data Out
Figure 6. I/O Structure
Figure 8. Output Structure
17
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