W78E052DDG Nuvoton Technology Corporation of America, W78E052DDG Datasheet - Page 16

• Manufacturer Part Number: W78E052DDG
• Description: IC MCU 8-BIT 8K FLASH 40-DIP
• Manufacturer: Nuvoton Technology Corporation of America
• Series: W78r

Specifications of W78E052DDG

• Core Processor: 8052
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: EBI/EMI, UART/USART
• Peripherals: POR, WDT
• Number Of I /o: 36
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

8.2.1 Working Registers
There are four sets of working registers, each consisting of eight 8-bit registers. These are termed as
Banks 0, 1, 2, and 3. Individual registers within these banks can be directly accessed by separate in-
structions. These individual registers are named as R0, R1, R2, R3, R4, R5, R6 and R7. However, at
one time the W78E054D/W78E052D/W78E051D series can work with only one particular bank. The
bank selection is done by setting RS1-RS0 bits in the PSW. The R0 and R1 registers are used to store
the address for indirect accessing.
FFH
2EH
2DH
2BH
2AH
80H
7FH
30H
2FH
2CH
29H
28H
27H
26H
25H
24H
23H
22H
21H
20H
1FH
18H
17H
10H
0FH
08H
07H
00H
7F
6F
5F
4F
3F
2F
1F
0F
77
67
57
47
37
27
17
07
Figure 8- 3 Scratch-pad RAM
W78E054D/W78E052D/W78E051D Data Sheet
7E
6E
5E
4E
3E
2E
1E
0E
76
66
56
46
36
26
16
06
7D
6D
5D
4D
3D
2D
1D
0D
75
65
55
45
35
25
15
05
Indirect RAM
- 16 -
Direct RAM
7C
6C
5C
4C
3C
2C
1C
0C
74
64
54
44
34
24
14
04
Bank 3
Bank 2
Bank 1
Bank 0
7B
6B
5B
4B
3B
2B
1B
0B
73
63
53
43
33
23
13
03
7A
6A
5A
4A
3A
2A
1A
0A
72
62
52
42
32
22
12
02
79
71
69
61
59
51
49
41
39
31
29
21
19
11
09
01
78
70
68
60
58
50
48
40
38
30
28
20
18
10
08
00