參數(shù)資料
型號(hào): 286C6116FSC
廠商: ZiLOG, Inc.
英文描述: CMOS Z8 MICROCONTROLLER
中文描述: 單片機(jī)的CMOS Z8
文件頁(yè)數(shù): 14/46頁(yè)
文件大?。?/td> 388K
代理商: 286C6116FSC
14
Z86C61/62/96
Z8
M
ICROCONTROLLER
PIN FUNCTIONS
(Continued)
Port 1
(P17-P10). Port 1 is an 8-bit, byte programmable,
bidirectional, TTL compatible port. It has multiplexed Ad-
dress (A7-A0) and Data (D7-D0) ports. For Z86C61/62/96,
these eight I/O lines can be programmed as Input or
Output lines or can be configured under software control
as an address/data port for interfacing external memory.
When used as an I/O port, Port 1 may be placed under
handshake control. In this configuration, Port 3 line P33
and P34 are used as the handshake controls RDY1 and
/DAV1.
Memory locations greater than 16,384 are referenced
through Port 1. To interface external memory, Port 1 must
be programmed for the multiplexed Address/Data mode.
If more than 256 external locations are required, Port 0
must output the additional lines.
Port 1 can be placed in high-impedance state along with
Port 0, /AS, /DS, and R//W, allowing the microcontroller to
share common resources in multiprocessor and DMA
applications. Data transfers can be controlled by assign-
ing P33 as a Bus Acknowledge input, and P34 as a Bus
request output (Figure 11).
OEN
Out
In
PAD
Port 1
(AD7-AD0)
MCU
TTL Level Shifter
Auto Latch
R
500 K
8
Handshake Controls
/DAV1 and RDY1
(P33 and P34)
Figure 11. Port 1 Configuration
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