TC9028AP View Datasheet(PDF) - Toshiba

Part Name

Description

Manufacturer

TC9028AP

TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic

Toshiba 

TC9028AP/AF

2.7 Data memory (RAM)

Data memory stores data to be processed by the user.

There are two data memory addressing modes. One is register indirect addressing mode, where the L

register specifies an address. The other is direct addressing mode, where the lower 3 bits of the

instruction field directly specify an address.

Figure 2.3 shows the L register and data memory configuration.

The data memory contents are undefined at reset. Make initial settings using the initialization

routine.。

L register

(LR)

3210

Data memory address specification

FEDCBA 9 8 7 6 5 4 3 2 1 0

Note:

Area directly addressable

Figure 2.3 L register and data memory configuration

2.8 ALU, Accumulator

2.8.1

ALU

The ALU is a circuit which performs various

operations on 4 bit binary data.

The ALU performs operations according to

instructions and outputs results (4 bit), carry

data (C) and zero detection data (Z).

2.8.2 Accumulator (Acc)

The accumulator is a 4bit register. It stores

source data and results.

Internal bus

ALU

Cin

CF

C

Z SF

Note: Cin indicates carry input

specified by instruction.

Figure 2.4 ALU and flags

MSB

3

2

LSB

1

0

Figure 2.5 Accumulator

6

2002-04-19

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