Holtek HT66F20 Manual page 18

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
PA0~PA� Port A
PB0~PB� Port B
PC0~PC� Port C
PD0~PD� Port D
PE0~PE� Port E
PF0~PF� Port F
AN0~AN� ADC inp�t
VREF ADC reference inp�t
C0-� C�- Comparator 0� � inp�t
C0+� C�+ Comparator 0� � inp�t
C0X� C�X Comparator 0� � o�tp�t
TCK0~TCK2 TM0~TM2 inp�t
TP0_0� TP0_� TM0 I/O
TP�A TM� I/O
TP�B_0~TP�B_2 TM� I/O
TP2_0� TP2_� TM2 I/O
INT0� INT� Ext. Interr�pt 0� �
PINT Peripheral Interr�pt
PCK Peripheral Clock o�tp�t
SDI SPI Data inp�t
SDO SPI Data o�tp�t
SCS SPI Slave Select
SCK SPI Serial Clock
SCL I C Clock
2
SDA I C Data
2
SCOM0~SCOM3 SCOM0~SCOM3
OSC� HXT/ERC pin
OSC2 HXT pin
XT� LXT pin
XT2 LXT pin
RES Reset inp�t
VDD Power s�pply*
Rev. 2.50
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
OP I/T O/T
PAWU
ST CMOS
PAPU
PBPU ST CMOS
PCPU ST CMOS
PDPU ST CMOS
PEPU ST CMOS
PFPU ST CMOS
ACERL AN —
ADCR� AN —
CP0C
AN —
CP�C
CP0C
AN —
CP�C
CP0C
CP�C — CMOS PA0� PA5 or PF0� PF�
PRM0
PRM� ST —
TMPC0
ST CMOS PA0� PC5 or PC6� PD5
PRM2
TMPC0
ST CMOS PA� or PC�
PRM2
TMPC0
ST CMOS PC0� PC�� PC5� or -� -� PE4
PRM2
TMPC�
ST CMOS PC3� PC4 or PD�� PD4
PRM2
PRM� ST —
PRM0 ST —
PRM0 — CMOS PC2 or PC5
PRM0 ST —
PRM0 — CMOS PA5 or PD3 or PB6
PRM0 ST CMOS PB5 or PD0 or PD�
PRM0 ST CMOS PA� or PD� or PD6
PRM0 ST NMOS PA� or PD� or PD6
PRM0 ST NMOS PA6 or PD2 or PB�
SCOMC — SCOM PC0� PC�� PC6� PC�
CO HXT —
CO — HXT
CO LXT —
CO — LXT
CO ST —
— PWR —
�8
Pin-Shared Mapping
—
—
—
—
—
—
PA0~PA�
PB5
PA3� PC3
PA2� PC2
PA2� PA4� PC2 or PD2� PD3� PD0
PA3� PA4 or PC4� PC5 or PE6� PE�
PC3 or PC4
PA6 or PD2 orPB�
PB�
PB2
PB3
PB4
PB0
—
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