UPD784031Y データシートの表示（PDF） - NEC => Renesas Technology
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UPD784031Y Datasheet PDF : 88 Pages
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µPD784031Y
6.2.2 Control registers
(1) Program counter (PC)
The program counter is a 20-bit register whose contents are automatically updated when the program is executed.
Figure 6-3. Program Counter (PC) Format
19
0
PC
(2) Program status word (PSW)
This register holds the statuses of the CPU. Its contents are automatically updated when the program is executed.
Figure 6-4. Program Status Word (PSW) Format
15
14
13
12
11
10
9
8
PSWH
UF RBS2 RBS1 RBS0
–
–
–
–
PSW
7
PSWL
S
6
5
4
3
2
1
0
Z
RSSNote AC
IE
P/V
0
CY
Note This flag is provided to maintain compatibility with the 78K/III Series. Be sure to clear this flag to 0, except when
the software for the 78K/III Series is used.
(3) Stack pointer (SP)
This is a 24-bit pointer that holds the first address of the stack.
Be sure to write 0 to the higher 4 bits of this pointer.
Figure 6-5. Stack Pointer (SP) Format
23
20
0
SP
0000
20
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