參數(shù)資料
型號: Z86418
廠商: ZiLOG, Inc.
英文描述: Z8 8-BIT Mouse Controller(8位CMOS鼠標微控制器)
中文描述: Z8 8位鼠標控制器(8位的CMOS鼠標微控制器)
文件頁數(shù): 9/27頁
文件大小: 340K
代理商: Z86418
Z86418
Zilog
Z8 8-Bit Mouse Controller
DS97KEY1404
P R E L I M I N A R Y
9
1
PIN FUNCTIONS
XTAL1, XTAL2
. Crystal in, crystal out (time-based input
and output, respectively). These pins connect a parallel-
resonant crystal, LC, or an external single-phase clock
(4 MHz max.) to the on-chip clock oscillator and buffer.
Port 0
(P02–P00). Port 0 is a 3-bit, I/O programmable, bi-
directional, CMOS-compatible I/O port. These three I/O
lines can be configured under software control to be input
or output (Figure 5). When Port 0 is configured as an input
port, all lines have the capability to be globally configured
(ROM mask option) for a 100K pull-down or pull-up resis-
tor. The pull-up/pull-down resistor can be disabled as well.
(No current is drawn if disabled.) Graphs indicating current
versus pin voltage are shown in Figures 6 and 7. Port
00–02 can be accessed through the P0 register (register
address 00). The upper 5 bits of this 8-bit register always
reads “11111.” Writing to the upper 5 bits has no effect
(See Figure 33.) The lower 3 bits of the P0 register are
read/write.
Figure 5. Port 0 Configuration
OE
Out
In
Pad
Pull-Down
Enable
Pull-Up
Enable
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