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Description
The uPD8155 and uPD8156 are uPD8085A family components having 256× 8-bit static RAM,3
programmable l/O ports, and a programmable timer.They directly interface to the multiplexeduPD8085A bus with no external logic. The uPD8155 has an active low chip enable while the uPD8156 is active high.
The uPD8155 anduPD8156 contain 2048 bits (256×8) ofstatic RAM. The 256 words of memory may be selected anywhere within the system's 64K memory space by coding the upper 8 bits of address from the uPD8085A as a chip select.
The two general purpose 8-bit ports (PA and PB) may be programmed for input or output either in interruptor sta-tus mode. The single 6-bit port(PC) may be used as a control for PA and PB or as a general purpose lI/O port.
The uPD8155 anduPD8156 are programmed for their sys-
tem personalities by writing into their command/status (C/S) registers upon system initialization.
The timer is a single 14-bit down counter which is programmable for 4 modes of output operation; see table 3.
Features
256×8-bit static RAM
Two programmable 8-bit l/O ports
One programmable 6-bit I/O port
Single +5 V±10% power supply
Directly interfaces to the uPD8085A and
uPD8085A-2
Programmable 14-bit binary counter/timer
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