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

Direct Addressing Mode: A program can branch to any address in the ROM memory space by executing

the JMPL, BRL, or CALL instruction. Each of these instructions replaces the 14 program counter bits

(PC13–PC0) with 14-bit immediate data.

Current Page Addressing Mode: The MCU has 64 pages of ROM with 256 words per page. A program

can branch to any address in the current page by executing the BR instruction. This instruction replaces the

eight low-order bits of the program counter (PC7–PC0) with eight-bit immediate data. If the BR instruction

is on a page boundary (address 256n + 255), executing that instruction transfers the PC contents to the next

physical page, as shown in figure 94. This means that the execution of the BR instruction on a page

boundary will make the program branch to the next page.

Instruction

[P]

Opcode

p3 p2 p1 p0

B register

Accumulator

00

B3 B2 B1 B0 A3 A2 A1 A0

Referenced ROM address RA13 RA12 RA11 RA10 RA9 RA8 RA7 RA6 RA5 RA4 RA3 RA2 RA1 RA0

Address Designation

ROM data

RO9 RO8 RO7 RO6 RO5 RO4 RO3 RO2 RO1 RO0

Accumulator, B register

B3

B2 B1 B0

A3

A2

A1

A

0

If RO8 = 1

ROM data

RO9 RO8 RO7 RO6 RO5 RO4 RO3 RO2 RO1 RO0

Output registers R1, R2 R23 R22 R21 R20 R13 R12 R11 R10 If RO9 = 1

Pattern Output

Figure 93 P Instruction

111

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