參數(shù)資料
型號(hào): L8708H
廠商: ZiLOG, Inc.
英文描述: IR/Low-Voltage Microcontroller
中文描述: 紅外/低電壓微控制器
文件頁數(shù): 21/66頁
文件大?。?/td> 599K
代理商: L8708H
Z86L88/81/86/87/89/73
IR/Low-Voltage Microcontroller
DS96LV00800
P R E L I M I N A R Y
21
1
Port 2
(P27-P20). Port 2 is an 8-bit, bidirectional, CMOS
compatible I/O port. These eight I/O lines can be indepen-
dently configured under software control as inputs or out-
puts. Port 2 is always available for I/O operation. A mask
option is available to connect eight 200 kOhms (
±
50%)
pull-up resistors on this port. Bits programmed as outputs
are globally programmed as either push-pull or open-
drain. Port 2 may be placed under handshake control. In
this configuration, Port 3 lines, P31 and P36 are used as
the handshake controls lines /DAV2 and RDY2. The hand-
shake signal assignment for Port 3, lines P31 and P36 is
dictated by the direction (input or output) assigned to Bit 7,
Port 2 (Figure 15). The CCP POR resets with the eight bits
of Port 2 configured as inputs with open-drain outputs.
Port 2 also has an 8-bit input OR and an AND gate which
can be used to wake up the part (Figure 41). P20 can be
programmed to access the edge selection circuitry (Figure
24).
Figure 15. Port 2 Configuration
Open-Drain
OEN
Out
In
PAD
Port 2 (I/O)
Optional
Handshake Controls
/DAV2 and RDY2
(P31 and P36)
Z86LXX
MCU
VCC
200 k
Mask
Option
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