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HT98R068-1 Datasheet(PDF) 44 Page - Holtek Semiconductor Inc

Part # HT98R068-1
Description  Two Way Radio 8-Bit MCU
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT98R068-1 Datasheet(HTML) 44 Page - Holtek Semiconductor Inc

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HT98R068-1
Two Way Radio 8-Bit MCU
HT98R068-1
Two Way Radio 8-Bit MCU
PAWKn: PA wake-up function enable
0: disable
1: enable
PACn/PBCn/PCCn/PDCn/PECn: I/O type selection
0: output
1: input
PAPUn/PBPUn/PCPUn/PDPUn/PEPUn: Pull-high function enable
0: disable
1: enable
I/O Port Control Registers
Each Port has its own control register, known as PAC, PBC, PCC, PDC and PEC which controls the
input/output configuration. With this control register, each I/O pin with or without pull-high resistors
can be reconfigured dynamically under software control. For the I/O pin to function as an input, the
corresponding bit of the control register must be written as a “1”. This will then allow the logic state
of the input pin to be directly read by instructions. When the corresponding bit of the control register
is written as a “0”, the I/O pin will be setup as a CMOS output. If the pin is currently setup as an
output, instructions can still be used to read the output register. However, it should be noted that the
program will in fact only read the status of the output data latch and not the actual logic status of the
output pin.
Pin-shared Functions
The flexibility of the microcontroller range is greatly enhanced by the use of pins that have more
than one function. Limited numbers of pins can force serious design constraints on designers but by
supplying pins with multi-functions, many of these difficulties can be overcome. For some pins, the
chosen function of the multi-function I/O pins is set by configuration options while for others the
function is set by application program control.
External Interrupt Input
The external interrupt pin, INT, is pin-shared with an I/O pin. To use the pin as an external interrupt
input the correct bits in the INTC0 register must be programmed. The pin must also be setup as an
input by setting the PAC3 bit in the Port Control Register. A pull-high resistor can also be selected
via the appropriate port pull-high resistor register. Note that even if the pin is setup as an external
interrupt input the I/O function still remains.
External Timer/Event Counter Input
The Timer/Event Counter pins, TMR0, TMR1 and TMR2 are pin-shared with I/O pins. For these
shared pins to be used as Timer/Event Counter inputs, the Timer/Event Counter must be configured
to be in the Event Counter or Pulse Width Capture Mode. This is achieved by setting the appropriate
bits in the Timer/Event Counter Control Register. The pins must also be setup as inputs by setting
the appropriate bit in the Port Control Register. Pull-high resistor options can also be selected using
the port pull-high resistor registers. Note that even if the pin is setup as an external timer input the
I/O function still remains.


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