W78E052DDG Nuvoton Technology Corporation of America, W78E052DDG Datasheet - Page 63

• 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: -

18 ISP(IN-SYSTEM PROGRAMMING)
ISP is the ability of program MCU to be programmed while F/W code in AP-ROM or LD-ROM. (Note:
Timer 0 for program, erase, read on ISP mode. ISP operation voltage 3.3- 5.5V)
by timer interrupt, then enter In-System
(CPU will be wakened from idle mode
Start Timer and enter idle Mode.
Setting Timer (about 450 us)
and enable timer interrupt
Setting control registers
(conditions depend on
Programming Mode ?
Programming mode)
MOV CHPCON,#03h
MOV SFRAL,#FFh
MOV SFRAH,#FFh
user's application)
MOV SFRCN,#3Fh
MOV SFRFD,#ABh
Enter In-System
START
YES
W78E054D/W78E052D/W78E051D Data Sheet
NO
- 63 -
GO
Execute the normal
Application program
END
Publication Release Date: Dec 29, 2009
In-System Programming Mode
procedure of entering
Part 1:2KB APROM
Revision A09