HD4048412 データシートの表示（PDF） - Renesas Electronics

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HD4048412

4-Bit Single-Chip Microcomputer

Renesas Electronics 

HD404849 Series

Memory Register Addressing Mode: The memory registers (MR), which are located in 16 addresses

from $040 to $04F, are accessed with the LAMR and XMRA instructions.

ROM Addressing Modes and the P Instruction

The MCU has four ROM addressing modes, as shown in figure 92 and described below.

[JMPL]

[BRL]

[CALL]

1st word of instruction

2nd word of instruction

Opcode

p3 p2 p1 p0 d9 d 8 d 7 d 6 d 5 d 4 d3 d2 d1 d0

Program counter PC13 PC12 PC11 PC10 PC9 PC8 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0

Direct Addressing

Instruction

[BR] Opcode b 7 b 6 b 5 b 4 b3 b2 b1 b0

Program counter PC13 PC12 PC11 PC10 PC9 PC8 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0

Current Page Addressing

Instruction

[CAL]

Opcode

d5 d 4 d3 d2 d1 d 0

00 000 0 00

Program counter PC13 PC12 PC11 PC10 PC9 PC8 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0

Zero Page Addressing

[TBR]

Instruction

Opcode

p3 p2 p1 p0

B register

Accumulator

00

B3 B2 B1 B0 A3 A2 A1 A0

Program counter PC13 PC12 PC11 PC10 PC9 PC8 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0

Table Data Addressing

Figure 92 ROM Addressing Modes

110

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