HD404639R Datasheet, PDF (13/135 Pages) Renesas Technology Corp – 4-Bit Single-Chip Microcomputer

Memory registers
64 MR(0) $040
65 ^MR(1) $041
66 ^MR(2) $042
67 ^MR(3) $043
68 ^MR(4) $044
69 ^MR(5) $045
70 MR(6) $046
71 ^MR(7) $047
72 MR(8) $048
73 MR(9) $049
74 ^MR(10) $04A
75 ^MR(11) $04B
76 ^MR(12) $04C
77 ^MR(13) $04D
78 ^MR(14) $04E
79 ^MR(15) $04F
Stack area
960 Level 16
Level 15
Level 14
Level 13
Level 12
Level 11
Level 10
Level 9
Level 8
Level 7
Level 6
Level 5
1023
Level 4
Level 3
Level 2
Level 1
$3C0
$3FF
PC₁₃–PC₀ : Program counter
ST: Status flag
CA: Carry flag
HD404639R Series
Bit 3
1020 ST
1021
1022
PC₁₀
CA
1023 PC₃
Bit 2
PC₁₃
PC₉
PC₆
PC₂
Bit 1
PC₁₂
PC₈
PC₅
PC₁
Bit 0
PC₁₁
PC₇
PC₄
PC₀
$3FC
$3FD
$3FE
$3FF
Figure 6 Configuration of Memory Registers and Stack Area, and Stack Position
Bank register (V: $03F)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
—
—
—
0
—
—
—
R/W
Not used Not used Not used V0
V0
Bank area selection
0
Bank 0 is selected
1
Bank 1 is selected
Note: After reset, the value in the bank register is 0, and therefore bank 0 is
selected.
Figure 7 Bank Register (V)
11