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參數資料
| 型號： | W78C438B |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 8-BIT Microcontroller(8位的微控制器) |
| 中文描述： | 8位微控制器（8位的微控制器） |
| 文件頁數： | 1/16頁 |
| 文件大小： | 221K |
| 代理商： | W78C438B |
W78C438B
8
-
BIT MICROCONTROLLER
Publication Release Date: April 1997
- 1 -
Revision A4
GENERAL DESCRIPTION
The W78C438B is a high-performance single-chip CMOS 8-bit microcontroller that is a derivative of
the W78C58 microcontroller family. The W78C438B 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
W78C438B 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 W78C438B 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 W78C438B 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: W78C438BP-16/24/33/40
100-pin PQFP: W78C438BF-16/24/33/40
相關PDF資料 |
PDF描述 |
|---|---|
| W78C438C40FL | 8-BIT MICROCONTROLLER |
| W78C438C40PL | 8-BIT MICROCONTROLLER |
| W78C458 | 8-BIT EMULATION MICROCONTROLLER |
| W78958B | 8-BIT EMULATION MICROCONTROLLER |
| W78958BF | 8-BIT EMULATION MICROCONTROLLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W78C438BF-16 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W78C438BF-24 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W78C438BF-33 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W78C438BF-40 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W78C438BP-16 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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