W78E052DDG Nuvoton Technology Corporation of America, W78E052DDG Datasheet - Page 12

• 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: -

W78E054D/W78E052D/W78E051D Data Sheet
7
FUNCTIONAL DESCRIPTION
The W78E054D/W78E052D/W78E051D series architecture consists of a core controller surrounded
by various registers, five general purpose I/O ports, 16K/8K/4K flash EPROM, 2K FLASH EPROM for
ISP function, 256 bytes of RAM, three timer/counters, and a serial port. The processor supports 111
different op-codes and references both a 64K program address space and a 64K data storage space.
7.1 On-Chip Flash EPROM
The W78E054D/W78E052D/W78E051D series include one 16K/8K/4K bytes of main Flash EPROM
for application program.
7.2 I/O Ports
The W78E054D/W78E052D/W78E051D series has four 8-bit ports and one extra 4-bit port. Port 0 can
be used as an Address/Data bus when external program is running or external memory/device is ac-
cessed by MOVC or MOVX instruction. In these cases, it has strong pull-ups and pull-downs, and
does not need any external pull-ups. Otherwise it can be used as a general I/O port with open-drain
circuit. Port 2 is used chiefly as the upper 8-bits of the Address bus when port 0 is used as an ad-
dress/data bus. It also has strong pull-ups and pull-downs when it serves as an address bus. Port1
and 3 act as I/O ports with alternate functions. Port 4 is only available on PLCC/PQFP/LQFP package
type. It serves as a general purpose I/O port as Port 1 and Port 3. Another bit-addressable bidirec-
tional I/O port P4. P4.3 and P4.2 are alternative function pins. It can be used as general I/O port or
external interrupt input sources ( INT2 / INT3 ).
7.3 Serial I/O
The W78E054D/W78E052D/W78E051D series have one serial port that is functionally similar to the
serial port of the original 8032 family. However the serial port on the W78E054D/ W78E052D/
W78E051D series can operate in different modes in order to obtain timing similarity as well.
7.4 Timers
Timers 0, 1, and 2 each consist of two 8-bit data registers. These are called TL0 and TH0 for Timer 0,
TL1 and TH1 for Timer 1, and TL2 and TH2 for Timer 2. The TCON and TMOD registers provide con-
trol functions for timers 0 and 1. The T2CON register provides control functions for Timer 2. RCAP2H
and RCAP2L are used as reload/capture registers for Timer 2.
The operations of Timer 0 and Timer 1 are the same as in the 8051 CPU. Timer 2 is a special feature
of the W78E054D/W78E052D/W78E051D: it is a 16-bit timer/counter that is configured and controlled
by the T2CON register. Like Timers 0 and 1, Timer 2 can operate as either an external event counter
or as an internal timer, depending on the setting of bit C/T2 in T2CON. Timer 2 has three operating
modes: capture, auto-reload, and baud rate generator. The clock speed at capture or auto-reload
mode is the same as that of Timers 0 and 1.
7.5 Interrupts
The Interrupt structure in the W78E054D/W78E052D/W78E051D is slightly different from that of the
standard 8052. Due to the presence of additional features and peripherals, the number of interrupt
sources and vectors has been increased. The W78E054D/W78E052D/W78E051D provides 8 interrupt
resources with four priority level, including four external interrupt sources, three timer interrupts, serial
I/O interrupts.
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