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After initial reset, all the interrupts including NMI are masked until both the stack pointers SP1 and SP2 are set
by software. Further, if either SP1 or SP2 is re-set when both are set already, the interrupts including NMI are
masked again until the other is re-set. Therefore, the settings of SP1 and SP2 must be done as a pair.
(3) Subroutine calls use 4 words (for PC evacuation) in the stack area for 16-bit data (SP1). Interrupts use 4 words
(for PC evacuation) in the stack area for 16-bit data (SP1) and 1 word (for F register evacuation) in the stack area
for 4-bit data.
S1C63016
0000H
(SP2/Data area)
00FFH
0100H
(SP1/Data area)
01FFH
0200H
(Data area)
07FFH
4 bits
3.3.2
Data ROM
The data ROM is used for loading various static data such as a character generator, and data can be read using the
same data memory access instructions as the RAM.
3.3.3
Display Memory
The display memory is a RAM used for storing LCD display data and is assigned to the data memory area. Each bit
can be assigned to the specific segment terminal by mask option.
The addresses that are not used for LCD display can be used as general purpose registers.
* These values are the maximum number of bits that can be allocated for
the segment outputs. Any address within the range listed above can be
specified.
S1C63003/004/008/016 TeChniCal Manual
(Rev. 1.1)
S1C63008
0000H
(SP2/Data area)
00FFH
0100H
(SP1/Data area)
01FFH
0200H
(Data area)
03FFH
4 bits
Figure 3.
3.1.1 RAM configuration
Table 3.
3.2.1 Data ROM capacity
Model
Capacity
S1C63016
4,096 words × 4 bits
2,048 words × 4 bits
S1C63008
S1C63004
1,024 words × 4 bits
S1C63003
Table 3.
3.3.1 Display memory capacity
Model
Capacity *
S1C63016
448 bits
S1C63008
400 bits
S1C63004
288 bits
S1C63003
110 bits
Seiko epson Corporation
S1C63004
0000H
(SP2/Data area)
00FFH
0100H
(SP1/Data area)
01FFH
4 bits
Address
8000H to 8FFFH
8000H to 87FFH
8000H to 83FFH
Not available
Address
F000H to F07FH
F000H to F07FH
F000H to F07FH
F000H to F03FH
3 CPu anD MeMORY
S1C63003
0000H
(SP2/Data area)
007FH
Unused area
0100H
(SP1/Data area)
017FH
4 bits
4/16-bit access area
4-bit access area
3-3
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