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Rev. 2.50
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Rev. 2.50
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HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
LXT: Low frequency crystal oscillator
*: VDD is the device power supply while AVDD is the ADC power supply. The AVDD pin is bonded
together internally with VDD.
**: VSS is the device ground pin while AVSS is the ADC ground pin. The AVSS pin is bonded together
internally with VSS.
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.
HT66F40
Pin Name
Function
OP
I/T
O/T
Pin-Shared Mapping
PA0~PA�
Port A
PAWU
PAPU
ST
CMOS
—
PB0~PB�
Port B
PBPU
ST
CMOS
—
PC0~PC�
Port C
PCPU
ST
CMOS
—
PD0~PD�
Port D
PDPU
ST
CMOS
—
PE0~PE�
Port E
PEPU
ST
CMOS
—
PF0~PF�
Port F
PFPU
ST
CMOS
—
AN0~AN�
ADC inp�t
ACERL
AN
—
PA0~PA�
VREF
ADC reference inp�t
ADCR�
AN
—
PB5
C0-� C�-
Comparator 0� � inp�t
CP0C
CP�C
AN
—
PA3� PC3
C0+� C�+
Comparator 0� � inp�t
CP0C
CP�C
AN
—
PA2� PC2
C0X� C�X
Comparator 0� � o�tp�t
CP0C
CP�C
PRM0
—
CMOS PA0� PA5 or PF0� PF�
TCK0~TCK2
TM0~TM2 inp�t
PRM�
ST
—
PA2� PA4� PC2 or PD2� PD3� PD0
TP0_0� TP0_�
TM0 I/O
TMPC0
PRM2
ST
CMOS PA0� PC5 or PC6� PD5
TP�A
TM� I/O
TMPC0
PRM2
ST
CMOS PA� or PC�
TP�B_0~TP�B_2 TM� I/O
TMPC0
PRM2
ST
CMOS PC0� PC�� PC5� or -� -� PE4
TP2_0� TP2_�
TM2 I/O
TMPC�
PRM2
ST
CMOS PC3� PC4 or PD�� PD4
INT0� INT�
Ext. Interr�pt 0� �
PRM�
ST
—
PA3� PA4 or PC4� PC5 or PE6� PE�
PINT
Peripheral Interr�pt
PRM0
ST
—
PC3 or PC4
PCK
Peripheral Clock o�tp�t
PRM0
—
CMOS PC2 or PC5
SDI
SPI Data inp�t
PRM0
ST
—
PA6 or PD2 orPB�
SDO
SPI Data o�tp�t
PRM0
—
CMOS PA5 or PD3 or PB6
SCS
SPI Slave Select
PRM0
ST
CMOS PB5 or PD0 or PD�
SCK
SPI Serial Clock
PRM0
ST
CMOS PA� or PD� or PD6
SCL
I
2
C Clock
PRM0
ST
NMOS PA� or PD� or PD6
SDA
I
2
C Data
PRM0
ST
NMOS PA6 or PD2 or PB�
SCOM0~SCOM3 SCOM0~SCOM3
SCOMC
—
SCOM PC0� PC�� PC6� PC�
OSC�
HXT/ERC pin
CO
HXT
—
PB�
OSC2
HXT pin
CO
—
HXT
PB2
XT�
LXT pin
CO
LXT
—
PB3
XT2
LXT pin
CO
—
LXT
PB4
RES
Reset inp�t
CO
ST
—
PB0
VDD
Power s�pply*
—
PWR
—
—