HT56R688(2010) Ver la hoja de datos (PDF) - Holtek Semiconductor
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HT56R688 Datasheet PDF : 104 Pages
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HT56R67/HT56R668/HT56C668/HT56R678/HT56C678/HT56R688
Pin Description
The following table depicts the pins common to all devices.
Pin Name
I/O
Configuration
Option
Description
PA0/BZ
PA1/BZ
PA2
PA3/PFD
I/O
PA4/TMR2
PA5/TMR3
PA6~PA7
BZ/BZ
PFD
Bidirectional 8-bit input/output port. Each individual bit on this port can be
configured as a wake-up input using the PAWU register. Software instruc-
tions determine if the pin is a CMOS output or Schmitt trigger input. A
pull-high resistor can be connected to each pin using the PAPU register. Pins
PA0, PA1, PA3, PA4 and PA5 are shared with BZ, BZ, PFD, TMR2 and
TMR3 respectively, the function of which is chosen via configuration option.
Pins PA0~PA3 can also be setup as open drain pins using the MISC register.
PB0/AN0~
PB7/AN7
I/O
Bidirectional 8-bit input/output port. Software instructions determine if the pin
is a CMOS output or Schmitt trigger input. A pull-high resistor can be con-
¾
nected to each pin using the PBPU register. PB is pin-shared with the A/D in-
put pins. The A/D inputs are selected via software instructions. Once
selected as an A/D input, the I/O function and pull-high resistor selections are
disabled automatically.
PD0/PWM0~
PD3/PWM3
PD4/INT0
PD5/INT1
I/O
PD6/TMR0
PD7/TMR1
Bidirectional 8-bit input/output port. Software instructions determine if the pin
is a CMOS output or Schmitt trigger input. A pull-high resistor can be con-
¾
nected to each pin using the PDPU register. The PWM outputs,
PWM0~PWM3, are pin shared with pins PD0~PD3, the function of which is
chosen using the PWM registers. Pins PD4~PD7 are pin-shared with INT0,
INT1, TMR0 and TMR1 respectively.
OSC1
OSC2
OSC1, OSC2 are connected to an external RC network or external crystal,
I
O
Crystal or RC
or EC
determined by configuration option, for the internal system clock. If the RC
system clock option is selected, pin OSC2 can be used to measure the sys-
tem clock at 1/4 frequency. EC is external clock mode, we can input clock
source directly to OSC1 pin.
OSC3
OSC4
I
O
32768Hz
OSC3 and OSC4 are connected to a 32768Hz crystal oscillator to form a real
time clock for fSUB. This 32768Hz crystal is disabled/enabled by configuration
option.
VREF
I
¾
A/D reference voltage input pin
RES
I
¾
Schmitt Trigger reset input. Active low
VDD
¾
¾
Positive power supply
VSS
¾
¾
Negative power supply, ground
AVDD
¾
¾
Analog positive power supply
AVSS
¾
¾
Analog negative power supply, ground
Rev. 1.20
5
March 4, 2010
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