HT45F0084 Datasheet, PDF (24/160 Pages) Holtek Semiconductor Inc – Cord-free Vacuum Cleaner ASSP Flash MCU

HT45F0084
Cord-free Vacuum Cleaner ASSP Flash MCU
RAM 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, known as the Special Function Data
Memory. Here are located registers which 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 known as the General
Purpose Data Memory, which is reserved for general purpose use. All locations within this area are
read and write accessible under program control.
The overall Data Memory is subdivided into two banks. The Special Purpose Data Memory registers are
accessible in all banks, with the exception of the EEC register at address 40H, which is only accessible 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 Memory for the device is the address 00H.
Bank0� Bank1
00H
Spe�ial Pu�pose
Data �emo�y
�FH
80H
Gene�al Pu�pose
Data �emo�y
1�8 Bytes
FFH
Data Memory Structure
Rev. 1.00
24
March 17, 2017