W78E052DDG Nuvoton Technology Corporation of America, W78E052DDG Datasheet - Page 73

• 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: -

3. There are no duty cycle requirements on the XTAL1 input.
21.3.2 Program Fetch Cycle
Notes:
1. P0.0−P0.7, P2.0−P2.7 remain stable throughout entire memory cycle.
2. Memory access time is 3 TCP.
3. Data have been latched internally prior to
4. "Δ" (due to buffer driving delay and wire loading) is 20 nS.
21.3.3 Data Read Cycle
Notes:
1. Data memory access time is 8 TCP.
2. "Δ" (due to buffer driving delay and wire loading) is 20 nS.
PARAMETER
Address Valid to ALE Low
Address Hold from ALE Low
ALE Low to
Data Hold after PSEN High
Data Float after PSEN High
ALE Pulse Width
PSEN
PSEN Pulse Width
PARAMETER
ALE Low to RD Low
Data Hold from RD High
Data Float from RD High
RD Low to Data Valid
RD Pulse Width
Low to Data Valid
PSEN
Low
SYMBOL
Tdar
Tdda
Tddh
Tddz
Tdrd
SYMBOL
Taas
Taah
Tapl
Tpda
Tpdh
Tpdz
Talw
Tpsw
W78E054D/W78E052D/W78E051D Data Sheet
PSEN
MIN.
3 TCP -Δ
-
0
0
6 TCP -Δ
- 73 -
going high.
MIN.
1 TCP -
Δ
1 TCP -
Δ
1 TCP -
Δ
-
0
0
2 TCP -
Δ
3 TCP -
Δ
TYP.
-
-
-
-
6 TCP
TYP.
-
-
-
-
2 TCP
3 TCP
-
-
Publication Release Date: Dec 29, 2009
MAX.
3 TCP +Δ
4 TCP
2 TCP
2 TCP
-
MAX.
-
-
-
2 TCP
1 TCP
1 TCP
-
-
UNIT
nS
nS
nS
nS
nS
nS
nS
nS
UNIT
nS
nS
nS
nS
nS
Revision A09
NOTES
1, 2
1
2
NOTES
4
1, 4
4
2
3
4
4