W78E052DDG Nuvoton Technology Corporation of America, W78E052DDG Datasheet - Page 20

• 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: -

9.1 SFR Detail Bit Descriptions
Port 0
Mnemonic: P0
STACK POINTER
Mnemonic: SP
DATA POINTER LOW
Mnemonic: DPL
DATA POINTER HIGH
Mnemonic: DPH
Port 0 Pull Up Option Register
DPL
SP
P0
Bit:
BIT
7-0
Bit:
BIT
7-0
Bit:
BIT
7-0
Bit:
BIT
7-0
Bit:
NAME
P0.[7:0]
NAME
SP.[7:0]
7
P0.7
7
SP.7
7
DPL.7
NAME
DPL.[7:0]
NAME
DPH.[7:0]
7
7
DPH.7
Data pointer low
Stack pointer
Port 0
FUNCTION
Port 0 is an open-drain bi-directional I/O port if SFR P0UPR.0 (bit P0UP) clear to “0”, and
when SFR P0UPR.0 (bit P0UP) set to “1”, Port 0 pins are internally pulled-up.
This port also provides a multiplexed low order address/data bus during accesses to external
memory.
FUNCTION
The Stack Pointer stores the Scratch-pad RAM address where the stack begins. In other
words it always points to the top of the stack.
6
P0.6
6
SP.6
6
DPL.6
6
6
DPH.6
FUNCTION
This is the low byte of the standard 8052 16-bit data pointer.
FUNCTION
This is the high byte of the standard 8052 16-bit data pointer.
5
P0.5
5
SP.5
5
DPL.5
5
5
DPH.5
82H
81H
80H
W78E054D/W78E052D/W78E051D Data Sheet
(87)
4
P0.4
4
SP.4
4
DPL.4
4
4
DPH.4
(86)
- 20 -
(85)
3
P0.3
3
SP.3
3
DPL.3
3
3
DPH.3
(84)
(83)
2
P0.2
2
SP.2
2
DPL.2
2
DPH.2
2
(82)
1
P0.1
1
SP.1
1
DPL.1
1
DPH.1
1
(81)
(80)
Address: 80h
Address: 81h
Address: 82h
Address: 83h
0
P0.0
0
SP.0
0
DPL.0
0
DPH.0
0
0000 0000B
0000 0111B
1111 1111B