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PDF W78E054D Data sheet ( Hoja de datos )
| Número de pieza | W78E054D | |
| Descripción | 8-BIT MICROCONTROLLER | |
| Fabricantes | Nuvoton | |
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W78E054D/W78E052D Data Sheet
1 GENERAL DESCRIPTION
The W78E054D/W78E052D series is an 8-bit microcontroller which can accommodate a wider fre-
quency range with low power consumption. The instruction set for the W78E054D/W78E052D series is
fully compatible with the standard 8052.
The W78E054D/W78E052D series contains 16K/8K bytes Flash EPROM programmable by hardware
writer; a 256 bytes RAM; four 8-bit bi-directional (P0, P1, P2, P3) and bit-addressable I/O ports; an ad-
ditional 4-bit I/O port P4; three 16-bit timer/counters; a hardware watchdog timer and a serial port. The-
se peripherals are supported by 8 sources 4-level interrupt capability. To facilitate programming and
verification, the Flash EPROM inside the W78E054D/W78E052D series allows the program memory to
be programmed and read electronically. Once the code is confirmed, the user can protect the code for
security.
The W78E054D/W78E052D series microcontroller has two power reduction modes, idle mode and
power-down mode, both of which are software selectable. The idle mode turns off the processor clock
but allows for continued peripheral operation. The power-down mode stops the crystal oscillator for
minimum power consumption. The external clock can be stopped at any time and in any state without
affecting the processor. The W78E054D/W78E052D series contains In-System Programmable (ISP)
2KB LDROM for loader program, operating voltage from 3.3V to 5.5V.
Note: If the applied VDD is not stable, especially with long transition time of power on/off, it’s
recommended to apply an external RESET IC to the RST pin for improving the stability of sys-
tem.
-4-
http://www.Datasheet4U.com
1 page  
W78E054D/W78E052D Data Sheet
P1.5
P1.6
P1.7
RST
RXD, P3.0
INT2, P4.3
TXD, P3.1
INT0, P3.2
INT1, P3.3
T0, P3.4
T1, P3.5
1
2
3
4
5
6
7
8
9
10
11
PQFP 44-pin
TQFP 44-pin
33 P0.4, AD4
32 P0.5, AD5
31 P0.6, AD6
30 P0.7, AD7
29 EA
28 P4.1
27 ALE
26 PSEN
25 P2.7, A15
24 P2.6, A14
23 P2.5, A13
P1.5
P1.6
P1.7
RST
P3.0
INT2, P4.3
P3.1
INT0, P3.2
INT1, P3.3
T0, P3.4
T1, P3.5
NC
1
2
3
4
5
6
7
8
9
10
11
12
LQFP 48-pin
36 NC
35 P0.4, AD4
34 P0.5, AD5
33 P0.6, AD6
32 P0.7, AD7
31 EA
30 P4.1
29 ALE
28 PSEN
27 P2.7, A15
26 P2.6, A14
25 P2.5, A13
-8-
5 Page 
W78E054D/W78E052D Data Sheet
8 MEMORY ORGANIZATION
The W78E054D/W78E052D series separate the memory into two separate sections, the Program
Memory and the Data Memory. The Program Memory is used to store the instruction op-codes, while
the Data Memory is used to store data or for memory mapped devices.
FFH
Indirect
Addressing
RAM
80H
7FH
Direct &
Indirect
Addressing
RAM
00H
SFRs Direct
Addressing
Only
FFFFH
64K Bytes
External
Data
memory
2KB
LDROM
3FFFH
3800H
3FFFH
14K/8KB
APROM
or
16KB
APROM
0000H
Figure 8–1 Memory Map
0000H
0000H
8.1 Program Memory (on-chip Flash)
The Program Memory on the W78E054D/W78E052D series can be up to 16K/8K bytes (2K bytes for
ISP F/W, share with the W78E054D) long. All instructions are fetched for execution from this memory
area. The MOVC instruction can also access this memory region.
8.2 Scratch-pad RAM and Register Map
As mentioned before the W78E054D/W78E052D series have separate Program and Data Memory ar-
eas. There are also several Special Function Registers (SFRs) which can be accessed by software.
The SFRs can be accessed only by direct addressing, while the on-chip RAM can be accessed by ei-
ther direct or indirect addressing.
- 14 -
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| PDF Descargar | [ Datasheet W78E054D.PDF ] | |
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