HT68F04 Holtek Semiconductor, HT68F04 Datasheet - Page 18

• Manufacturer Part Number: HT68F04
• Description: Small Package Enhanced Flash Type 8-Bit MCU
• Manufacturer: Holtek Semiconductor

Note:
RAM Data Memory
The Data Memory is a volatile area of 8-bit wide RAM in-
ternal memory and is the location where temporary in-
formation is stored.
Structure
Divided into two sections, the first of these is an area of
RAM, known as the Special Function Data Memory.
Here are located registers which are necessary for cor-
rect operation of the device. Many of these registers can
be read from and written to directly under program con-
trol, however, some remain protected from user manipu-
lation.
Rev. 1.00
Programmer Pin
* may be resistor or capacitor. The resistance
of * must be greater than 1kW or the capacitance
of * must be less than 1nF.
DATA
RES
CLK
Programmer and MCU Pins
MCU Pins
PA7
PA0
PA2
HT66F03/HT66F04/HT68F03/HT68F04
18
The second area of Data Memory is known as the Gen-
eral Purpose Data Memory, which is reserved for gen-
eral purpose use. All locations within this area are read
and write accessible under program control.
The overall Data Memory is subdivided into two banks
for all the devices. The Special Purpose Data Memory
registers are accessible in all banks, with the exception
of the EEC register at address 40H, which is only acces-
sible in Bank 1. Switching between the different Data
Memory banks is achieved by setting the Bank Pointer
to the correct value. The start address of the Data Mem-
ory for all devices is the address 00H.
HT66F03
HT68F03
HT66F04
HT68F04
Device
HT66F03 Special Purpose Data Memory
Capacity
64´8
96´8
40H~7FH
40H~9FH
Bank 0
available only
available only
40H (EEC)
40H (EEC)
April 16, 2010
Bank 1
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