m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 5

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

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
2. Structure of register
The figure of each register structure describes its functions, contents at reset, and attributes as follows :
BEFORE USING THIS USER'S MANUAL
CHAPTER 1 HARDWARE
CHAPTER 2 APPLICATION
CHAPTER 3 APPENDIX
This chapter describes features of the microcomputer, operation of each peripheral function and electric
characteristics.
This chapter describes usage and application examples of peripheral functions, based mainly on setting examples
of related registers.
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.
b7
b6
: Bit in which nothing is arranged
Note 1. Contents immediately after reset release
Note 2. Bit attributes••••••The attributes of control register bits are classified into 3 bytes : read-only, write-only
b5
0
b4
b3
b2
0••••••“0” at reset release
1••••••“1” at reset release
Undefined••••••Undefined or reset release
b1
••••••Contents determined by option at reset release (D) Note
b0
CPU mode register (CPUM) [Address:3B
0
1
2
3
4
5
6
7
B
and read and write. In the figure, these attributes are represented as follows :
R••••••Read
Main clock (X
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".
Internal system clock selection bit
••••••Read disabled
••••••Read enabled
Bits
Contents immediately after reset release
Name
IN
-X
OUT
: Bit that is not used for control of the corresponding function
) stop bit
W••••••Write
b1b0
00: Single-chip mode
01:
10:
11:
0 : 0 page
1 : 1 page
0 : Operating
1 : Stopped
0 : X
1 : X
••••••Write disabled
16
••••••Write enabled
••••••“0” write
]
Function
IN
CIN
-X
-X
Not available
OUT
COUT
selected
selected
Bit attributes
(Note 1)
(Note 2)
At reset
0
0
0
0
0
1
R W