Initial Reset - Epson 6200A Core Cpu Manual

2.5.4 Initial reset

On reset, the registers and flags are set as shown in Table 2.5.4.1.
<Difference between S1C6200 and S1C6200A>
There is a difference in the setting value of the D (decimal) flag at initial reset between the S1C6200 and the
S1C6200A.
D (decimal) flag setting
When using the model loaded with the S1C6200 Core CPU, set or reset the D flag in the user's initial
routine before using an arithmetic instruction. (refer to the SDF and RDF instructions.)
S1C6200/6200A CORE CPU MANUAL
Table 2.5.4.1 Reset value
Program Counter Step PCS
Program Counter Page PCP
Program Counter Bank PCB
New Page Pointer NPP
New Bank Pointer NBP
Stack Pointer SP
Index Register IX
Index Register IY
Register Pointer RP
General Register A
General Register B
Interrupt Flag I
Decimal Flag D
Zero Flag Z
Carry Flag C
Table 2.5.4.2 D (decimal) flag initial setting
CPU Core
EPSON
2 MEMORY AND OPERATIONS
Bit length Value
8 00H
4 01H
1 00H
4 01H
1 Undefined
8 Undefined
12 Undefined
12 Undefined
4 Undefined
4 Undefined
4 Undefined
1 0H
1 *
1 Undefined
* S1C6200
1 Undefined
S1C6200A S1C6200
0 Undefined
...Undefined
S1C6200A ...0
15