參數(shù)資料
型號: Z80181
廠商: ZiLOG, Inc.
英文描述: SMART ACCESS CONTROLLER (SAC⑩)
中文描述: 智能門禁控制器(國資委⑩)
文件頁數(shù): 11/74頁
文件大?。?/td> 540K
代理商: Z80181
2-11
Zilog
DS971800500
Z80181
S
MART
A
CCESS
C
ONTROLLER
SAC
Pin Name
Pin Number
Input/Output, Tri-State
Function
IEI
62
In, Active 1
Interrupt enable input signal.
IEI is used with the IEO to
form a priority daisy chain when there is more than one
interrupt-driven peripheral.
IEO
60
Out, Active 1
The interrupt enable output signal.
In the daisy-chain
interrupt control, IEO controls the interrupt of external
peripherals. IEO is active when IEI is “1” and the CPU is not
servicing an interrupt from the on-chip peripherals.
/ROMCS
61
Out, Active 0
ROM Chip select.
Used to access ROM. Refer to “Func-
tional Description” on chip select signals for further expla-
nation.
/RAMCS
30
Out, Active 0
RAM Chip Select.
Used to access RAM. Refer to “Func-
tional Description” on chip select signals for further expla-
nation.
/RESET
98
In, Active 0
Reset signal.
/RESET signal is used for initializing the MPU
and other devices in the system. It must be kept in the
active state for a period of at least 3 system clock cycles.
EXTAL
94
In, Active 1
Crystal oscillator connecting terminal.
A parallel reso-
nant crystal is recommended. If an external clock source
is used as the input to the Z180 Clock Oscillator unit,
supply the clock into this terminal.
XTAL
93
Out
Crystal oscillator connecting terminal.
PHI
90
Out, Active 1
System Clock.
Single-phase clock output from Z181
MPU.
E
86
Out, Active 1
Enable Clock.
Synchronous Machine cycle clock output
during a bus transaction.
TEST
73
Out
Test pin.
Used in the open state.
V
CC
39, 82
Power Supply.
+5 Volts
V
SS
18, 40, 59,
63, 92
Power Supply.
0 Volts
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