MIC94084 查看數據表（PDF） - Micrel
零件编号
产品描述 (功能)
比赛名单
MIC94084 Datasheet PDF : 50 Pages
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MB91F127/F128
No.
Pin name
Input/output
circuit type
Description
41
A24/P70/FRCK/
TCI2
Bit 24 of external address bus.
[P70] A24, FRCK and TCI2 are available as general input ports
when they are not used.
D
[FRCK] External clock input of free-run timer. This function is
active when external clock input of free-run timer is used.
[TCI2] External clock input of timer 2. This function is active
when external clock input of timer 2 is used.
42
RDY/P80
External ready input. Enter “0” when bus cycle under execution
D
does not complete. This terminal is available as general input/
output port when it is not used.
43
BGRNT/P81/IN0
External bus open receive output. This terminal outputs “L”
when an external bus is released. This terminal is available as
D
general input/output port when it is not used.
[IN0] Input capture input.
This function is active when input capture is under input opera-
tion.
44
BRQ/P82/IN1
External bus open request input. Enter “1” when releasing exter-
nal bus. This terminal is available as general input/output port
D
when it is not used.
[IN1] Input capture input.
This function is active when input capture is under input opera-
tion.
45
RD/P83
External bus read strobe.
D
This terminal is available as general input/output port when it is
not used.
46
WR0/P84
D
External bus write strobe.Control signals and data bus byte po-
sitions are related as the following :
16-bit bus
width
8-bit bus width
Single chip
mode
D31 to D24
WR0
WR0
(port allowed)
47
WR1/P85
D
D23 to D16
WR1
(port allowed) (port allowed)
Note : WR1 is set to Hi-z during resetting.
For using with 16-bit bus width, use an external pull-up
resistor.
[P84 or P85] Available as general input/output ports when WR0
and WR1 are not used.
48
CS0/PA0
49
CS1/PA1
50
CS2/PA2
Chip select 0 output (Low active)
Chip select 1 output (Low active)
D
Chip select 2 output (Low active)
[PA0,1,or 2] Available as general input/output ports when CS0,
CS1 and CS2 are not used.
(Continued)
6
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