M37640E8 View Datasheet(PDF) - MITSUBISHI ELECTRIC

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M37640E8

Single-Chip 8-BIT CMOS Microcontroller M37640E8-XXXFP Specification

MITSUBISHI ELECTRIC  

Mitsubishi Microcomputer

7600 Series

M37640E8-XXXF Preliminary Specification

2.4.1 Zero page

The 256 bytes zero page area is where the SFR and part of the internal RAM are allocated. The zero

page addressing modes can be used to specify memory and register addresses in this area (see

Figure 2-14.). These dedicated addressing modes enable access to this area with fewer instruction

cycles.

Addressing Modes for

zero page only

Addressing modes in which zero

page access is possible

Zero Page (2 byte instruction)

Zero Page Indirect (2 byte instruction)

Zero Page X (2 byte instruction)

Zero Page Y (2 byte instruction)

Zero Page Bit (2 byte instruction)

Zero Page Bit Relative (3 byte instruction)

Absolute (3 byte instruction)

Absolute X (3 byte instruction)

Absolute Y (3 byte instruction)

Relative (2 byte instruction)

Indirect (3 byte instruction)

Indirect X (2 byte instruction)

Indirect Y (2 byte instruction)

Addressing modes in which

special page access is possible

Special Page (2 byte instruction)

Addressing mode

for special page only

Figure 2-14. Zero Page and Special Page Addressing Modes

2.4.2 Special Page

The 256 bytes from address FF0016 to FFFF16 are called the special page area. In this area special

page addressing can be used to specify memory addresses (see Figure 2-14.). This dedicated special

page addressing mode enables access to this area with fewer instruction cycles. Frequently used

subroutines are normally stored in this area.

2.4.3 Special Function Registers

The special function registers (SFR) are used for controlling the functional blocks, such as I/O ports,

Timers, UART, and so forth (see Table 2-1.). The reserved addresses should not be read or written to.

Memory Map

7/9/98

2-15

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