E202075_HD404889 Datasheet, PDF (37/202 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip LCD Circuit

HD404889/HD404899/HD404878/HD404868 Series
$040
$041
$042
$043
$044
$045
$046
$047
$048
$049
$04A
$04B
$04C
$04D
$04E
$04F
MR (0)
MR (1)
MR (2)
MR (3)
MR (4)
MR (5)
MR (6)
MR (7)
MR (8)
MR (9)
MR (10)
MR (11)
MR (12)
MR (13)
MR (14)
MR (15)
(a) Memory registers
960
1,023
Level
Level
Level
Level
Level
Level
Level
Level
Level
Level
Level
Level
Level
Level
Level
Level
16 $3C0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1 $3FF
1020
Bit 3
ST
1021 PC10
1022 CA
1023 PC3
(b) Stack area
PC13 to PC0 : Program counter
ST
: Status flag
CA
: Carry flag
Bit 2
PC13
Bit 1
PC12
Bit 0
PC11 $3FC
PC9
PC8
PC7 $3FD
PC6
PC5
PC4 $3FE
PC2
PC1
PC0 $3FF
Figure 6 Configuration of Memory Registers and Stack Area, and Stack Position
Bank register (V: $03F)
Bit
3
2
1
0
Read/Write
—
—
—
R/W
Initial value on reset
—
—
—
0
Bit name
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.
Applies to HD404889 and HD404899 Series.
Figure 7 Bank Register (V)
35