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Z86C44 Datasheet(PDF) 2 Page - Zilog, Inc. |
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Z86C44 Datasheet(HTML) 2 Page - Zilog, Inc. |
2 / 70 page Z86C34/C35/C36/C44/C45/C46 CMOS Z8® MCUs with ASCI UART ZiLOG 2 P R E L I M I N A R Y DS007601-Z8X0499 GENERAL DESCRIPTION (Continued) configurable under software control to provide timing, sta- tus signals, parallel I/O with or without handshake, and ad- dress/data bus for interfacing external memory. To unburden the system from coping with real-time tasks such as counting/timing and data communication, the Z8 offer two on-chip counter/timers with a large number of user-selectable modes. With ROM/ROMless selectivity, the Z86C44/C45/C46 provide both external memory and preprogrammed ROM, which enables this Z8® MCU to be used in high-volume ap- plications, or where code flexibility is required. Note: All signals with an overline are active Low. For exam- ple, B/ W, for which WORD is active Low, and B/W, for which BYTE is active Low. Power connections follow these conventional descriptions: Connection Circuit Device Power VCC VDD Ground GND VSS Figure 1. Functional Block Diagram Port 3 Counter/ Timers (2) Interrupt Control Two Analog Comparators Port 2 I/O (Bit Programmable) ALU FLAG Register Pointer Register File Machine Timing & Inst. Control RESET WDT, POR Program Memory Program Counter V GND XTAL 44 Port 0 AS DS R/W RESET Output Input Port 1 8 Address or I/O (Nibble Programmable) Address/Data or I/O (Byte Programmable) (C44/C45/C46 Only) (C44/C45/C46 Only) CC Full-Duplex UART 16-Bit Baud Rate Generator |
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