3822 datasheet(5/328 Pages) RENESAS

5 / 328 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 forms (mask ROM version), ROM programming confirmation forms (One Time PROM

version) and mark specification forms 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 :

0 : f(XIN)/2

(high-speed mode)

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

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

: Bit in which nothing is allocated

Name

Functions

At reset

Values immediately after reset release

Bit attributes

(Note 1)

Processor mode bits

Stack page selection bit

Fix this bit to “1.”

Internal system clock selection bit

00: Single-chip mode

01:

10:

11:

Not available

b1b0

0 : 0 page

1 : 1 page

0 : XIN-XOUT selected

(middle-/high-speed mode)

1 : XCIN-XCOUT selected

(low-speed mode)

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

Notes 1: Values immediately after reset release

0••••••“0” at reset release

1••••••“1” at reset release

?••••••Undefined or reset release

(Note 2)

CPU mode register (CPUM) [Address:3B16]

Bits

••••••Read enabled

••••••Read disabled

••••••Fixed to “0”

••••••Fixed to “1”

1 : f(XIN)/8

(middle-speed mode)

Main clock division ratio

selection bit

1 : Stopped

Main clock (XIN–XOUT) stop bit

0 : Oscillating

Port XC switch bit

0 : I/O port

1 : XCIN, XCOUT

R••••••Read

••••••Write enabled

••••••Write disabled

••••••Only “0” write enabled

••••••Fix to “0”

••••••Fix to “1”

W••••••Write

0 : f(XIN)/2

(high-speed mode)

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