W78E052DDG Nuvoton Technology Corporation of America, W78E052DDG Datasheet - Page 24

• 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: -

Watchdog Timer Control Register
Mnemonic: WDTC
Port 1
Mnemonic: P1
Serial Port Control
BIT
0
Bit:
BIT
7
6
5
2-0
Bit:
BIT
7-0
Bit:
NAME
P1.[7:0]
NAME
ALE_OFF
NAME
ENW
CLRW
WIDL
PS2-0
7
P1.7
7
7
SM0/FE
ENW
FUNCTION
General purpose I/O port. Most instructions will read the port pins in case of a port
read access, however in case of read-modify-write instructions, the port latch is
read.
Enable watch-dog if set.
Clear watch-dog timer and Pre-scalar if set. This flag will be cleared automati-
If this bit is set, watch-dog is enabled under IDLE mode. If cleared, watch-dog is
FUNCTION
1: Disenable ALE output
0: Enable ALE output
FUNCTION
cally.
disabled under IDLE mode. Default is cleared.
Watch-dog Pre-scalar timer select. Pre-scalar is selected when set PS2−0 as fol-
l
6
P1.6
6
ows:
6
SM1
CLRW
PS2 PS1 PS0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
5
P1.5
5
5
SM2
WIDL
0
1
0
1
0
1
0
1
W78E054D/W78E052D/W78E051D Data Sheet
4
P1.4
4
4
REN
PRE-SCALAR SELECT
-
- 24 -
128
256
16
32
64
2
8
4
3
P1.3
3
3
TB8
-
2
2
P1.2
2
RB8
PS2
1
1
P1.1
1
TI
PS1
Address: 90h
Address: 8FH
0
0
P1.0
0
RI
PS0