W78C438C

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...

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W78C438C Picture
SeekIC No. : 004544985 Detail

W78C438C: 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 mem...

floor Price/Ceiling Price

Part Number:
W78C438C
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/3/28

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Product Details

Description



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



Pinout

  Connection Diagram


Specifications

PARAMETER
SYMBOL
MIN.
MAX.
UNIT
DC Power Supply
VDD-VSS
-0.3
+7.0
V
Input Voltage
VIN
VSS -0.3
VDD +0.3
V
Operating Temperature
TOPR
0
70
°C
Storage Temperature
TSTG
-55
+150
°C



Description

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.




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