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HT68F40 Datasheet(PDF) 7 Page - Holtek Semiconductor Inc

Part # HT68F40
Description  Enhanced I/O Flash Type MCU 8-Bit MCU with EEPROM
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT68F40 Datasheet(HTML) 7 Page - Holtek Semiconductor Inc

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Pin Description
With the exception of the power pins, all pins on these devices can be referenced by their Port name, e.g. PA.0, PA.1
etc, which refer to the digital I/O function of the pins. However these Port pins are also shared with other function such
as the Serial Port pins etc. The function of each pin is listed in the following table, however the details behind how each
pin is configured is contained in other sections of the datasheet.
HT68F20
Pin Name
Function
OP
I/T
O/T
Pin-Shared Mapping
PA0~PA7
Port A
PAWU
PAPU
ST
CMOS
¾
PB0~PB5
Port B
PBPU
ST
CMOS
¾
PC0~PC3
Port C
PCPU
ST
CMOS
¾
C0-, C1-
Comparator 0, 1 input
CP0C
CP1C
AN
¾
PA3, PC3
C0+, C1+
Comparator 0, 1 input
AN
¾
PA2, PC2
C0X, C1X
Comparator 0, 1 output
¾
CMOS
PA0, PA5
TCK0, TCK1
TM0, TM1 input
¾
ST
¾
PA2, PA4
TP0_0
TM0 I/O
TMPC0
ST
CMOS
PA0
TP1_0, TP1_1
TM1 I/O
TMPC0
ST
CMOS
PA1, PC0
INT0, INT1
Ext. Interrupt 0, 1
¾
ST
¾
PA3, PA4
PINT
Peripheral Interrupt
¾
ST
¾
PC3
PCK
Peripheral Clock output
¾¾
CMOS
PC2
SDI
SPI Data input
¾
ST
¾
PA6
SDO
SPI Data output
¾¾
CMOS
PA5
SCS
SPI Slave Select
¾
ST
CMOS
PB5
SCK
SPI Serial Clock
¾
ST
CMOS
PA7
SCL
I
2C Clock
¾
ST
NMOS
PA7
SDA
I
2C Data
¾
ST
NMOS
PA6
SCOM0~SCOM3
SCOM0~SCOM3
SCOMC
¾
SCOM
PC0, PC1, PC2, PC3
OSC1
HXT/ERC pin
CO
HXT
¾
PB1
OSC2
HXT pin
CO
¾
HXT
PB2
XT1
LXT pin
CO
LXT
¾
PB3
XT2
LXT pin
CO
¾
LXT
PB4
RES
Reset input
CO
ST
¾
PB0
VDD
Power supply
¾
PWR
¾¾
VSS
Ground
¾
PWR
¾¾
Note:
I/T: Input type; O/T: Output type
OP: Optional by configuration option (CO) or register option
PWR: Power; CO: Configuration option; ST: Schmitt Trigger input
CMOS: CMOS output; NMOS: NMOS output
SCOM: Software controlled LCD COM; AN: Analog input pin
HXT: High frequency crystal oscillator
LXT: Low frequency crystal oscillator
As the Pin Description Summary table applies to the package type with the most pins, not all of the above listed
pins may be present on package types with smaller numbers of pins.
HT68F20/HT68F30/HT68F40/HT68F50/HT68F60
Rev. 1.00
7
November 3, 2009


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