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Z86C2116VSC Datasheet(PDF) 2 Page - Zilog, Inc. |
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Z86C2116VSC Datasheet(HTML) 2 Page - Zilog, Inc. |
2 / 35 page \2 Z86C21 MCU WITH 8K ROM GENERAL DESCRIPTION (Continued) To unburden the program from coping with the real-time tasks, such as counting/timing and serial data communi- cation, the Z86C21 offers two on-chip counter/timers with a large number of user selectable modes, and an on-board UART. Port 3 UART Counter/ Timers (2) Interrupt Control Port 2 I/O (Bit Programmable) ALU FLAGS Register Pointer Register File 256 x 8-Bit Machine Timing and Instruction Control Prg. Memory 8192 x 8-Bit Program Counter Vcc GND XTAL 44 Port 0 Output Input Address or I/O (Nibble Programmable) 8 Port 1 Address/Data or I/O (Byte Programmable) /AS /DS R//W /RESET Figure 1. Z86C21 Functional Block Diagram Notes: All Signals with a preceding front slash, "/", are active Low, e.g., B//W (WORD is active Low); /B/W (BYTE is active Low, only). Power connections follow conventional descriptions below: Connection Circuit Device Power V CC V DD Ground GND V SS |
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