HT46R068B_15 Datasheet, PDF (23/135 Pages) Holtek Semiconductor Inc – Enhanced A/D 8-Bit OTP MCU

HT46R068B/HT46R069B
Enhanced A/D 8-Bit OTP MCU
Data Memory
The  Data Memory is a volatile area of 8-bit wide RAM internal memory and is the location where
temporary information is stored.
Structure
Divided into two sections, the first of these is an area of RAM where special function registers are
located. These registers have fixed locations and are necessary for correct operation of the device.
Many of these registers can be read from and written to directly under program control, however,
some remain protected from user manipulation. The second area of Data Memory is reserved for
general purpose use. All locations within this area are read and write accessible under program
control.
Device
HT46R068B
HT46R069B
Capacity
512x8
1024x8
Banks
0~3
0~7
The two sections of Data Memory, the Special Purpose and General Purpose Data Memory are
located at consecutive locations. All are implemented in RAM and are 8 bits wide but the length of
each memory section is dictated by the type of microcontroller chosen. The start address of the Data
Memory for all devices is the address "00H".
All microcontroller programs require an area of read/write memory where temporary data can be
stored and retrieved for use later. It is this area of RAM memory that is known as General Purpose
Data Memory. This area of Data Memory is fully accessible by the user program for both read and
write operations. By using the "SET [m].i" and "CLR [m].i" instructions individual bits can be set
or reset under program control giving the user a large range of flexibility for bit manipulation in the
Data Memory.
For some devices, the Data Memory is subdivided into several banks, which are selected using
a Bank Pointer. Only data in Bank 0 can be directly addressed, data in Bank 1~Bank 7 must be
indirectly addressed.
Rev. 1.50
23
February 05, 2015