80C51 Microcontroller - 12T

Part No.	W78C438C
Datasheet	W78C438C.pdf
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.
Features	8-bit CMOS microcontroller Fully static design Up 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
Diagram	N/A
Package	PLCC84, PQFP100 (Lead-Free RoHS)
Other Files	N/A
Development Tools	N/A
Others	N/A

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