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HT48R063B датащи(PDF) 35 Page - Holtek Semiconductor Inc

номер детали HT48R063B
подробное описание детали  Enhanced I/O Type 8-Bit OTP MCU
Download  82 Pages
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT48R063B датащи(HTML) 35 Page - Holtek Semiconductor Inc

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HT48R063B/064B/065B/066B
Rev. 1.20
35
June 3, 2013
Input/Output Ports
Holtek microcontrollers offer considerable flexibility on
their I/O ports. Most pins can have either an input or out-
put designation under user program control. Addi-
tionally, as there are pull-high resistors and wake-up
software configurations, the user is provided with an I/O
structure to meet the needs of a wide range of applica-
tion possibilities.
For input operation, these ports are non-latching, which
means the inputs must be ready at the T2 rising edge of
instruction
²MOV A,[m]², where m denotes the port ad-
dress. For output operation, all the data is latched and
remains unchanged until the output latch is rewritten.
Pull-high Resistors
Many product applications require pull-high resistors for
their switch inputs usually requiring the use of an external
resistor. To eliminate the need for these external resis-
tors, when configured as an input have the capability of
being connected to an internal pull-high resistor. These
pull-high resistors are selectable via a register known as
PAPU, PBPU, PCPU, PDPU, PEPU and PFPU located in
the Data Memory. The pull-high resistors are imple-
mented using weak PMOS transistors. Note that pin PA7
does not have a pull-high resistor selection.
Port A Wake-up
If the HALT instruction is executed, the device will enter
the Idle/Sleep Mode, where the system clock will stop
resulting in power being conserved, a feature that is im-
portant for battery and other low-power applications.
Various methods exist to wake-up the microcontroller,
one of which is to change the logic condition on one of
the PA0~PA7 pins from high to low. After a HALT instruc-
tion forces the microcontroller into entering the
Idle/Sleep Mode, the processor will remain idle or in a
low-power state until the logic condition of the selected
wake-up pin on Port A changes from high to low. This
function is especially suitable for applications that can
be woken up via external switches. Note that pins PA0 to
PA7 can be selected individually to have this wake-up
feature using an internal register known as PAWK, lo-
cated in the Data Memory.
· PAWK, PAC, PAPU, PBC, PBPU, PCC, PCPU, PDC, PDPU, PEC, PEPU, PFC, PFPU Register
¨ HT48R063B
Register
Name
POR
Bit
76543210
PAWK
00H
PAWK7
PAWK6
PAWK5
PAWK4
PAWK3
PAWK2
PAWK1
PAWK0
PAC
FFH
PAC7
PAC6
PAC5
PAC4
PAC3
PAC2
PAC1
PAC0
PAPU
00H
¾
PAPU6
PAPU5
PAPU4
PAPU3
PAPU2
PAPU1
PAPU0
PBC
3FH
¾¾
PBC5
PBC4
PBC3
PBC2
PBC1
PBC0
PBPU
00H
¾¾
PBPU5
PBPU4
PBPU3
PBPU2
PBPU1
PBPU0
²¾² Unimplemented, read as ²0²
PAWKn: PA wake-up function enable
0: disable
1: enable
PACn/PBCn: I/O type selection
0: output
1: input
PAPUn/PBPUn: Pull-high function enable
0: disable
1: enable


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