參數(shù)資料
型號(hào): Z86418
廠商: ZiLOG, Inc.
英文描述: Z8 8-BIT Mouse Controller(8位CMOS鼠標(biāo)微控制器)
中文描述: Z8 8位鼠標(biāo)控制器(8位的CMOS鼠標(biāo)微控制器)
文件頁(yè)數(shù): 14/27頁(yè)
文件大?。?/td> 340K
代理商: Z86418
Z86418
Z8 8-Bit Mouse Controller
Zilog
14
P R E L I M I N A R Y
DS97KEY1404
PIN FUNCTIONS
(Continued)
Port 3
(P33, P32, P31). Port 3 is a 3-bit, CMOS-
compatible port with three fixed input lines (P33–P31).
These three lines can also be used as the interrupt
sources IRQ2, IRQ1, and IRQ0. P31 can also be
configured as a timer input.
All three lines can be configured globally by means of a
ROM mask option for a 100 Kohm pull-up or pull-down re-
sistor (Figure 10), or no pull-up/pull-down. No current is
drawn if pull-up/pull-down is disabled. Port 33–31 can be
accessed through the P3 register. The upper 4 bits of this
8-bit register always reads “1111.” Bit D0 reads 1. Bits D3,
D2 and D1 represent P33, P32 and P31 respectively (see
Figure 35).
Figure 10. Port 3 P31–P33 Configuration
P31
Pad
P33
IRQ2, TIN
Data Latch
Data Latch
IRQ1
Pad
Pull-Up
Enable
Pull-Down
/Enable
Pull-Up
Enable
Pull-Down
/Enable
P32
Pad
Data Latch
IRQ0
Pull-Up
Enable
Pull-Down
/Enable
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