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 :
1
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
RW
B
0
1
2
3
0
1
7
b0
b1
b2
b3
b4
b5
b6
b7
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
1
Notes 1: Values immediately after reset release
0
“0” at reset release
1
“1” at reset release
?
Undefined or reset release
(Note 2)
0
CPU mode register (CPUM) [Address:3B 16]
Bits
Read enabled
Read disabled
Fixed to “0”
Fixed to “1”
!
0
1
1 : f(XIN)/8
(middle-speed mode)
5
6
0
Main clock division ratio
selection bit
1 : Stopped
Main clock (XIN–XOUT) stop bit
0
!
0 : Oscillating
Port XC switch bit
0 : I/O port
1 : XCIN, XCOUT
11
R
Read
Write enabled
Write disabled
Only “0” write enabled
Fix to “0”
Fix to “1”
!
V
0
1
W
Write
4
0 : f(XIN)/2
(high-speed mode)
……