
I-12
EPSON
S1C60N08 TECHNICAL HARDWARE
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Memory Map)
CHAPTER
4PERIPHERAL CIRCUITS AND OPERATION
Peripheral circuits (timer, I/O, and so on) of the S1C60N08 Series are memory mapped. Thus, all the
peripheral circuits can be controlled by using memory operations to access the I/O memory. The follow-
ing sections describe how the peripheral circuits operate.
4.1 Memory Map
The data memory of the S1C60N08 Series has an address space of 865 words (913 words when display
memory is laid out in Page 2), of which 48 words are allocated to display memory and 33 words, to I/O
memory. Figure 4.1.1 shows the overall memory map for the S1C60N08 Series, and Tables 4.1.1(a)–(c), the
memory maps for the peripheral circuits (I/O space).
2
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Address
Page
Low
High
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 MA MB MC MD ME MF
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
RAM (256 words
× 4 bits)
R/W
1
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
RAM (256 words
× 4 bits)
R/W
Address
Page
Low
High
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
RAM (64 words
× 4 bits)
R/W
I/O mamory (see Table 4.1.1)
Unused area
3
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
RAM (256 words
× 4 bits)
R/W
Fig. 4.1.1 Memory map
Address
Page
Low
High
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0 or 2
4
5
6
Display memory (48 words
× 4 bits)
Page 0: R/W, Page 2: W only
Fig. 4.1.2 Display memory map
Notes: The display memory area can be selected from between Page 0 (040H–06FH) and Page 2
(240H–26FH) by mask option.
When Page 0 (040H–06FH) is selected, the display memory is assigned in the RAM area. So
read/write operation is allowed.
When Page 2 (240H–26FH) is selected, the display memory is assigned as a write-only memory.
Memory is not mounted in unused area within the memory map and in memory area not indi-
cated in this chapter. For this reason, normal operation cannot be assured for programs that
have been prepared with access to these areas.