3819 datasheet(5/218 Pages) RENESAS

5 / 218 page

BEFORE USING THIS USER'S MANUAL

This user's manual consists of the following three chapters. Refer to the chapter appropriate to your conditions, such

as hardware design or software development.

1. Organization

q CHAPTER 1 HARDWARE

This chapter describes features of the microcomputer, operation of each peripheral function and electric

characteristics.

q CHAPTER 2 APPLICATION

This chapter describes usage and application examples of peripheral functions, based mainly on setting examples

of related registers.

q CHAPTER 3 APPENDIX

This chapter includes precautions for systems development using the microcomputer, a list of control registers,

the masking confirmation (mask ROM version), and mark specifications which are to be submitted when ordering.

2. Structure of register

The figure of each register structure describes its functions, contents at reset, and attributes as follows :

Note 2. Bit attributes••••••The attributes of control register bits are classified into 3 bytes : read-only, write-only

and read and write. In the figure, these attributes are represented as follows :

: Bit in which nothing is arranged

Name

Function

At reset

Contents immediately after reset release

Bit attributes

(Note 1)

Processor mode bits

Stack page selection bit

Nothing arranged for these bits. These are write disabled

bits. When these bits are read out, the contents are "0".

Fix this bit to "0".

Main clock (XIN-XOUT) stop bit

Internal system clock selection bit

00: Single-chip mode

01:

10:

11:

Not available

b1b0

0 : 0 page

1 : 1 page

0 : Operating

1 : Stopped

0 : XIN-XOUT selected

1 : XCIN-XCOUT selected

: Bit that is not used for control of the corresponding function

Note 1. Contents immediately after reset release

0••••••“0” at reset release

1••••••“1” at reset release

Undefined••••••Undefined or reset release

••••••Contents determined by option at reset release (D) Note

R••••••Read

••••••Read enabled

!••••••Read disabled

W••••••Write

••••••Write enabled

! ••••••Write disabled

••••••“0” write

(Note 2)

CPU mode register (CPUM) [Address:3B 16]

Bits

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