W78E052DDG Nuvoton Technology Corporation of America, W78E052DDG Datasheet - Page 14

• 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
The W78E054D/W78E052D/W78E051D series separate the memory into two separate sections, the
Program Memory and the Data Memory. The Program Memory is used to store the instruction op-
codes, while the Data Memory is used to store data or for memory mapped devices.
8.1 Program Memory (on-chip Flash)
The Program Memory on the W78E054D/W78E052D/W78E051D series can be up to 16K/8K/4K
bytes (2K bytes for ISP F/W, share with the W78E054D) long. All instructions are fetched for execution
from this memory area. The MOVC instruction can also access this memory region.
8.2 Scratch-pad RAM and Register Map
As mentioned before the W78E054D/W78E052D/W78E051D series have separate Program and Data
Memory areas. There are also several Special Function Registers (SFRs) which can be accessed by
software. The SFRs can be accessed only by direct addressing, while the on-chip RAM can be ac-
cessed by either direct or indirect addressing.
MEMORY ORGANIZATION
FFH
80H
7FH
00H
Addressing
Addressing
Direct &
Indirect
Indirect
RAM
RAM
SFRs Direct
Addressing
Only
W78E054D/W78E052D/W78E051D Data Sheet
Figure 8- 1 Memory Map
FFFFH
0000H
64K Bytes
External
m em ory
Data
- 14 -
14K/8k/4k
AP Flash
ISP AP
On Chip
Bytes
Bytes
2K
3FFFH
3800H
0000H
or
AP Flash
On Chip
Bytes
16K
0000H
3FFFH