UPD17P136ACT datasheet(89/292 Pages) NEC

89 / 292 page

CHAPTER 9 REGISTER FILE (RF)

9.2 FUNCTIONS OF THE REGISTER FILE

9.2.1 Functions of the Register File

The register file is mainly used as a control register for specifying conditions for peripheral hardware.

This control register is allocated within the register file at addresses 00H to 3FH.

The rest of the register file (40H to 7FH) overlaps with data memory. As shown in 9.2.3, because of this overlap,

this area of the register file is the same as normal memory with one exception: The register file manipulation

instructions PEEK and POKE can be used with this area of memory but not with normal data memory.

9.2.2 Functions of Control Register

The peripheral hardware whose conditions can be controlled by control registers is listed below.

For details concerning peripheral hardware and the control register, see the section for the peripheral hardware

concerned.

•

Stack pointer (SP)

•

Basic interval timer (BTM)

•

Power-down reset

•

Ports

•

8-bit timer counter (TM0, TM1)

•

Interrupt functions

•

AC zero cross detector (ZCROSS)

•

Serial interface (SIO)

•

A/D converter

Figure 9-2. Relationship Between the Register File and Data Memory

Column address

Control register

System register

67 8

9 A B C D E F

Port register

BANK1

Unmounted

Data memory

BANK0

Port register

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