W78E052DDG Nuvoton Technology Corporation of America, W78E052DDG Datasheet - Page 74

• 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: -

21.3.4 Data Write Cycle
Note: "Δ" (due to buffer driving delay and wire loading) is 20 nS.
21.3.5 Port Access Cycle
Note: Ports are read during S5P2, and output data becomes available at the end of S6P2. The timing
data are referenced to
21.3.6 Program Operation
Note: Flash data can be accessed only in flash mode. The RST pin must pull in VIH status, the ALE
pin must pull in VIL status, and the
PARAMETER
ALE Low to WR Low
Data Valid to WR Low
Data Hold from WR High
WR Pulse Width
PARAMETER
Port Input Setup to ALE Low
Port Input Hold from ALE Low
Port Output to ALE
PARAMETER
VPP Setup Time
Data Setup Time
Data Hold Time
Address Setup Time
Address Hold Time
gram Operation
OECTRL Setup Time
OECTRL Hold Time
Data Valid from OE
CE Program Pulse Width for Pro-
OE Setup Time
OE High to Output Float
ALE, since it provides a convenient reference.
SYMBOL
Tdaw
Tdad
Tdwd
Tdwr
PSEN
W78E054D/W78E052D/W78E051D Data Sheet
SYMBOL
Tpds
Tpdh
Tpda
Symbol
TVPS
TDS
TDH
TAS
TAH
TPWP
TOCS
TOCH
TOES
TDFP
TOEV
pin must pull in VIH status.
- 74 -
MIN.
3 TCP -Δ
1 TCP -Δ
1 TCP -Δ
6 TCP -Δ
MIN.
1 TCP
0
1 TCP
Min.
2.0
2.0
2.0
2.0
0
290
2.0
2.0
2.0
0
-
TYP.
-
-
-
6 TCP
TYP.
-
-
-
TYP.
-
-
-
-
-
300
-
-
-
-
-
MAX.
3 TCP +Δ
-
-
-
MAX.
-
-
-
Max.
-
-
-
-
-
310
-
-
-
130
150
UNIT
nS
nS
nS
UNIT
nS
nS
nS
nS
Unit
μS
μS
μS
μS
μS
μS
μS
μS
μS
nS
nS