NEC PD17062 Manual do Utilizador descarregar pdf (Página 29)

100

101

PD17062

5. DATA MEMORY (RAM)

Data memory is used to store data for operations and control. Simply by executing an appropriate

instruction, data can be written to and read from data memory at any time.

5.1 STRUCTURE OF DATA MEMORY

Fig. 5-1 shows the structure of data memory.

As shown in Fig. 5-1, data memory is divided into three units called banks. These three banks are called

BANK0, BANK1, and BANK2.

In each bank, data is assigned an address in units of four bits. The high-order three bits are called the row

address, while the low-order four bits are called the column address. For example, the data memory location

having row address 1H and column address AH is referred to as the data memory location having address

1AH. One address consists of four bits of memory. These four bits are called a nibble.

Data memory is divided into the blocks described in Sections 5.1.1 to 5.1.5, according to function.

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 295 296

Comentários a estes Manuais

Sem comentários

NEC PD17062 Manual do Utilizador Página 29

Comentários a estes Manuais

Manuais e produtos relacionados com não NEC PD17062