W78E516DPG Nuvoton Technology Corporation of America, W78E516DPG Datasheet - Page 65

• Manufacturer Part Number: W78E516DPG
• Description: IC MCU 8-BIT 64K FLASH 44-PLCC
• Manufacturer: Nuvoton Technology Corporation of America
• Series: W78r

Specifications of W78E516DPG

• 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: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

17 F04KBOOT MODE (BOOT FROM 4K BYTES OF LDROM )
The W78E516D/W78E058D boots from APROM program (64K/32K bytes) by default at power on
reset. On some occasions, user can force the W78E516D/W78E058D to boot from the LDROM
program (4K bytes) at power on reset. The settings for this special mode as follow.
F04KBOOT MODE
NOTE1: The possible situation that you need to enter F04KBOOT mode is when the APROM program
can not run normally and W78E516D/W78E058D can not jump to LDROM to execute on chip
programming function. Then you can use this F04KBOOT mode to force the W78E516D/W78E058D
jump to LDROM and run on chip programming procedure. When you design your system, you can
connect the pins P26,P27 to switches or jumpers. For example in a CD ROM system, you can connect
the P26 and P27 to PLAY and EJECT buttons on the panel. When the APROM program is fail to
execute the normal application program. User can press both two buttons at the same time and then
switch on the power of the personal computer to force the W78E516D/W78E058D to enter the
F04KBOOT mode. After power on of personal computer, you can release both PLAY and EJECT
button.
NOTE2: In application system design, user must take care the P2, P3, ALE, /EA and /PSEN pin value
at reset to avoid W78E516D/W78E058D entering the programming mode or F04KBOOT mode in
normal operation.
P 2.7
P 2.6
R S T
The Reset Tim ing For Entering
Preliminary W78E516D/ W78E058D Data Sheet
P4.3
X
L
F04K BO O T M ode
300m s
P2.7
X
L
P2.6
X
L
- 65 -
10ms
Mode
FO4KBOOT
FO4KBOOT
Publication Release Date: July 30, 2008
Hi-Z
Hi-Z
Revision A01