Block Diagram; Pin Assignment - Holtek HT66F488 Manual

HT66F488/HT66F489
A/D Flash MCU with EEPROM

Block Diagram

Flash/EEPROM
Programming Circuitry
(ICP)/OCDS
EEPROM Flash
Data Program
Memory Memory
I/O CTM

Pin Assignment

PC4/AN4/SSEG22
PC3/AN3/SSEG23
PC0/AN2/SSEG26
PB7/STP/RX/AN1/SSEG27
PB6/STCK/TX/AN0/SSEG28
PD0/ICPDA/SCOM0/SSEG0
PD1/SCOM1/SSEG1
PD2/SCOM2/SSEG2
PD3/SCOM3/SSEG3
PD4/SCOM4/SSEG4
PD5/SCOM5/SSEG5
PA0/OCDSDA/SSEG6
Note: 1. If the pin-shared pin functions have multiple outputs simultaneously, the function used is determined by
the corresponding software control bit or configuration option.
2. AVDD&VDD means the VDD and AVDD are the double bonding. VSS&AVSS means the VSS and
AVSS are the double bonding.
3. HT66V488/489 is the EV chip, and the OCDSDA, OCDSCK pins are for EV chip only.
Rev. 1.21
Watchdog Internal RC
Timer Oscillators
Low Low
Voltage Voltage
Detect Reset
RAM Data Time
Memory Bases
STM PTMs
1 28 PC5/AN5/INT3/SSEG21
PC6/AN6/VREF/INT2/SSEG20
2 27
PB1/PTCK0/INT1/AN7/SSEG17
3 26
PB2/CTP/INT0/SSEG16
4 25
5 24 PB3/OSC2/XT2/SSEG15
6 23 PB4/OSC1/XT1/ICPCK/SSEG14
PB5/SSEG29
VSS/AVSS 7 22 VDD/AVDD
8 21 PA7/CTCK/SSEG13
9 20 PA6/PTCK1/SCS/SSEG12
10 19 PA5/PTP1/SCK/SCL/SSEG11
11 18 PA4/SDI/SDA/SSEG10
12 17 PA3/SDO/SSEG9
13 16 PA2/OCDSCK/SSEG8
14 15 PA1/SSEG7
HT66F488/489
HT66V488/489
28 SOP-A/SSOP-A
�
HXT/ LXT
Oscillators
8-bit
RISC Reset
MCU Circuit
Core
Interrupt
Controller
12-bit A/D
Converter
SIM
UART
Software
LCD
�ove��e� ��� 2�1�