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Z86C21 Datasheet(PDF) 9 Page - Zilog, Inc. |
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Z86C21 Datasheet(HTML) 9 Page - Zilog, Inc. |
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9 / 35 page  9 Z86C21 MCU WITH 8K ROM Port 2 (P27-P20). Port 2 is an 8-bit, bit programmable, bidirectional, CMOS compatible port. Each of these eight I/O lines can be independently programmed as an input or output or globally as an open-drain output. Port 2 is always available for I/O operation. When used as an I/O port, Port 2 may be placed under handshake control. In this configuration, Port 3 lines P31 and P36 are used as the handshake control lines /DAV2 and RDY2. The handshake signal assignment for Port 3 lines P31 and P36 is dictated by the direction (input or output) assigned to P27 (Figure 7). OEN Out In PAD Port 2 (I/O) Handshake Controls /DAV2 and RDY2 (P31 and P36) Z86C21 MCU TTL Level Shifter Auto Latch R ≈ 500 KΩ Open-Drain Figure 7. Port 2 Configuration |
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