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PDF W78C438C Data sheet ( Hoja de datos )
| Número de pieza | W78C438C | |
| Descripción | 8-BIT MICROCONTROLLER | |
| Fabricantes | Winbond | |
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W78C438C
GENERAL DESCRIPTION
8-BIT MICROCONTROLLER
The W78C438C is a high-performance single-chip CMOS 8-bit microcontroller that is a derivative of
the W78C58 microcontroller family. The W78C438C is functionally compatible with the W78C32,
except that it provides either a 64 KB program/1 MB data memory address or memory-mapped chip
select logic, five general I/O ports, and four external interrupts.
In the W78C32, two I/O ports, Port 1 and Port 3, are available for general-purpose use (Port 3 also
supports alternative functions), and Port 2 and Port 0 are used as the address bus and data bus,
respectively. To enable Port 0 and Port 2 to also be used as general purpose I/O ports, the
W78C438C provides two dedicated address ports (AP5 and AP6) that serve as address output for 64
KB of memory and one address/data port (DP4) that serves as ROM code input and external RAM
data input/output. Unlike the W78C32, this product does not require an external latch device for
multiplexing low byte addresses. The W78C438C also provides four pins (AP7.0−AP7.3) to support
either 64 KB program/1 MB data memory space or memory-mapped chip select logic, one parallel I/O
port (Port 8) without bit addressing mode, and two additional external interrupts (INT2 , INT3 ) .
The W78C438C is programmed in a manner fully compatible with that used to program the W78C32,
except that the external data RAM is accessed by the "MOVX @Ri" instruction. Address paging is
performed by loading page addresses into the HB (high byte) register, which is not a standard register
in the W78C32, before execution of the "MOVX @Ri" instruction.
FEATURES
• 8-bit CMOS microcontroller
• Fully static design
• DC to 40 MHz operation
• ROM-less operation
• 256-byte on-chip scratchpad RAM
• Either 64 KB program/1 MB data memory address space or 4 memory-mapped chip select pins
• One 8-bit data/address port
• Two 8-bit and one 4-bit (optional) address ports
• Five 8-bit bidirectional I/O ports
− Four 8-bit bit-addressable I/O ports and one 8-bit parallel I/O port
• Eight-source, two-level interrupt capability
• Three 16-bit timer/counters
• Four external interrupts
• One full-duplex serial channel
• Built-in power management
− Idle mode
− Power-down mode
• Packages:
− 84-pin PLCC: W78C438CP-24/40
− 100-pin PQFP: W78C438CF-24/40
Publication Release Date: July 1998
- 1 - Revision A1
1 page  
W78C438C
P8.0−P8.7 I/O Port
Functions are the same as those of Port 1 in the W78C31, except that they are mapped by the P8
register and not bit-addressable. The P8 register is not a standard register in the W78C32. Its address
is at 0A6H.
INT2 , INT3 External Interrupt, Input
Functions are similar to those of external INT0 , INT1 in the W78C32, except that the functions/status
of these interrupts are determined/shown by the bits in the XICON (External Interrupt Control)
register. The XICON register is bit-addressable but is not a standard register in the W78C32. Its
address is at 0C0H. For details, see the Functional Description below.
EA External Address, Input
Functions same as W78C32.
RST, XTAL1, XTAL2, PSEN , ALE
Functions same as W78C32.
BLOCK DIAGRAM
SFR
RAM
256
Bytes
DP4
AP5
AP6
AP7
Alternate
CPU
CORE
Timer2
Data Bus
Interrupt
Serial
Port
INT0
INT1
Timer0
Timer1
Port 8
Port 0
Port 1
Alternate
Port 2
Port 3
Alternate
INT2
INT3
Publication Release Date: July 1998
- 5 - Revision A1
5 Page 
W78C438C
DC CHARACTERISTICS
VDD−VSS = 5V ±10%, TA = 25° C, FOSC = 20 MHz, unless otherwise specified.
PARAMETER
SYM.
TEST CONDITIONS
Oper. Voltage
VDD
Oper. Current
IDD * No load
Idle Current
IIDLE Program idle mode
Pwdn Current
IPWDN Program power-down mode
Input Leakage
Current
ILK1 INT2 , INT3
Internal pull-high
Notes 1, 2
Input Leakage
Current
ILK2 RESET
Internal pull-low
Notes 1, 2
Input Leakage
Current
ILK3 EA , Port 0, DP4
Note 1
Input Leakage
Current
ILK4 P1, P2, P3, P8
Note 1
Output Low Voltage VOL1 IOL1 = 2 mA (Port 1, 2, 3, 8)
Output High Voltage VOH1 IOH1 = -100 µA (Port 1, 2, 3, 8)
Output Low Voltage
VOL2
IOL2 = 4mA
Note 3
(ALE, PSEN, P0, DP4)
Output High Voltage VOH2 IOH2 = -400 µA
Note 3
(ALE, PSEN, P0, DP4)
Output Low Voltage VOL3 IOL2 = 2 mA (AP5, AP6, AP7)
Output High Voltage VOH3 IOH2 = -100 µA (AP5, AP6, AP7)
Input Voltage
VILT VDD = 5V ±10%
Input Voltage
VIHT VDD = 5V ±10%
Input Voltage
VILC VDD = 5V ±10%, XTAL1 Note 5
Input Voltage
VIHC VDD = 5V ±10%, XTAL1 Note 5
Input Voltage
VILR VDD = 5V ±10%, RESET Note 5
Input Voltage
VIHR VDD = 5V ±10%, RESET Note 5
MIN.
4.5
-
-
-
-300
-10
-10
-50
-
2.4
-
2.4
-
2.4
0
2.4
0
3.5
0
2.4
TYP. MAX.
5 5.5
- 20
-7
- 50
- +10
- +300
- +10
- +10
- 0.45
--
- 0.45
--
- 0.45
--
- 0.8
- Note 4
- 0.8
- Note 4
- 0.8
- Note 4
UNIT
V
mA
mA
µA
µA
µA
µA
µA
V
V
V
V
V
V
V
V
V
V
V
V
Notes:
1. 0 < VIN < VDD, for INT2 , INT3 , RESET, EA , Port 0, DP4, P1, P2, P3 and P8 inputs in leakage.
2. Using an internal pull low/high resistor (approx. 30K).
3. ALE, PSEN , P0 and DP4 in external program or data access mode.
4. The maximum input voltage is VDD +0.2V.
5. XTAL1 is a CMOS input and RESET is a Schmitt trigger input.
- 11 -
Publication Release Date: July 1998
Revision A1
11 Page | ||
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| PDF Descargar | [ Datasheet W78C438C.PDF ] | |
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