
S1C6P466 TECHNICAL MANUAL
EPSON
9
CHAPTER 2: POWER SUPPLY AND INITIAL RESET
If an instruction which does not permit extended operation is used as the following instruction, the
operation is not guaranteed. Therefore, do not write data to the EXT register for initialization only.
Refer to the "S1C63000 Core CPU Manual" for extended addressing and usable instructions.
Table 2.2.2.1 Initial values
Name
Data register A
Data register B
Extension register EXT
Index register X
Index register Y
Program counter
Stack pointer SP1
Stack pointer SP2
Zero flag
Carry flag
Interrupt flag
Extension flag
Queue register
CPU core
Symbol
A
B
EXT
X
Y
PC
SP1
SP2
Z
C
I
E
Q
Number of bits
4
8
16
8
1
16
Setting value
Undefined
0110H
Undefined
0
Undefined
Name
RAM
Display memory
Other pheripheral circuits
Peripheral circuits
Number of bits
4
–
Setting value
Undefined
See Section 4.1, "Memory Map".
2.2.3 Terminal settings at initial resetting
The output port (R) terminals and I/O port (P) terminals are shared with special output terminals and
input/output terminals of the serial interface. These functions are selected by the software. At initial
reset, these terminals are set to the general purpose output port terminals and I/O port terminals. Set
them according to the system in the initial routine. In addition, take care of the initial status of output
terminals when designing a system.
Table 2.2.3.1 shows the list of the shared terminal settings.
Table 2.2.3.1 List of shared terminal settings
Terminal
name
R00
R01
R02
R03
R10–R13
R20–R23
P00–P03
P10
P11
P12
P13
P20
P21
P22
P23
Terminal status
at initial reset
R00 (High output)
R01 (High output)
R02 (High output)
R03 (High output)
R10–R13 (High output)
R20–R23 (High output)
P00–P03 (Input & Pull-up)
P10 (Input & Pull-up)
P11 (Input & Pull-up)
P12 (Input & Pull-up)
P13 (Input & Pull-up)
P20 (Input & Pull-up)
P21 (Input & Pull-up)
P22 (Input & Pull-up)
P23 (Input & Pull-up)
Special output
TOUT FOUT
CL
FR
TOUT
FOUT
CL
FR
Serial I/F
Master
Slave
SIN(I)
SOUT(O) SOUT(O)
SCLK(O) SCLK(I)
SRDY(O)
For setting procedure of the functions, see explanations for each of the peripheral circuits.