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參數(shù)資料
| 型號(hào)： | LPC47U33x |
| 廠商： | SMSC Corporation |
| 英文描述： | 100 Pin Enhanced Super I/O for LPC Bus with Consumer Features and SMBus Controller |
| 中文描述： | 100引腳增強(qiáng)的超級(jí)I / LPC總線為O與消費(fèi)特點(diǎn)和SMBus控制器 |
| 文件頁(yè)數(shù)： | 125/252頁(yè) |
| 文件大?。?/td> | 1000K |
| 代理商： | LPC47U33X |
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125
If "EN FLAGS” has not been executed: KIRQ
can be controlled by writing to P24. Writing a
zero to P24 forces KIRQ low; a high forces
KIRQ high.
MIRQ
If "EN FLAGS" has been executed and P25 is
set to a one:; IBF is inverted and gated onto
MIRQ. The MIRQ signal can be connected to
system interrupt to signify that the LPC47U33x
CPU has read the DBB register. If "EN FLAGS”
has not been executed, MIRQ is controlled by
P25, Writing a zero to P25 forces MIRQ low, a
high forces MIRQ high. (MIRQ is normally
selected as IRQ12 for mouse support).
Gate A20
A general purpose P21 is used as a software
controlled Gate A20 or user defined output.
8042 PINS
The 8042 functions P17, P16 and P12 are
implemented as in a true 8042 part. Reference
the 8042 spec for all timing. A port signal of 0
drives the output to 0. A port signal of 1 causes
the port enable signal to drive the output to 1
within 20-30nsec. After 500nsec (six 8042
clocks) the port enable goes away and the
external pull-up maintains the output signal as
1.
In 8042 mode, the pins can be programmed as
open drain. When programmed in open drain
mode, the port enables do not come into play. If
the port signal is 0 the output will be 0. If the
port signal is 1, the output tristates: an external
pull-up can pull the pin high, and the pin can be
shared. In 8042 mode, the pins cannot be
programmed as input nor inverted through the
GP configuration registers.
External Keyboard and Mouse Interface
Industry-standard PC-AT-compatible keyboards
employ a two-wire, bidirectional TTL interface
for data transmission. Several sources also
supply PS/2 mouse products that employ the
same type of interface. To facilitate system
expansion, the LPC47U33x provides four signal
pins that may be used to implement this
interface directly for an external keyboard and
mouse.
The LPC47U33x has four high-drive, open-drain
output, bidirectional port pins that can be used
for external serial interfaces, such as ISA
external
keyboard
and
interfaces. They are KCLK, KDAT, MCLK, and
MDAT. P26 is inverted and output as KCLK.
The KCLK pin is connected to TEST0. P27 is
inverted and output as KDAT. The KDAT pin is
connected to P10. P23 is inverted and output as
MCLK. The MCLK pin is connected to TEST1.
P22 is inverted and output as MDAT. The
MDAT pin is connected to P11. NOTE: External
pull-ups may be required.
PS/2-type
mouse
Keyboard Power Management
The keyboard provides support for two power-
saving modes: soft powerdown mode and hard
powerdown mode. In soft powerdown mode,
the clock to the ALU is stopped but the
timer/counter and interrupts are still active. In
hard power down mode the clock to the 8042 is
stopped.
Soft Power Down Mode
This mode is entered by executing a HALT
instruction. The execution of program code is
halted until either RESET is driven active or a
data byte is written to the DBBIN register by a
master CPU. If this mode is exited using the
interrupt, and the IBF interrupt is enabled, then
program execution resumes with a CALL to the
interrupt routine, otherwise the next instruction
is executed. If it is exited using RESET then a
normal reset sequence is initiated and program
execution starts from program memory location
0.
Hard Power Down Mode
This mode is entered by executing a STOP
instruction. The oscillator is stopped by
disabling the oscillator driver cell. When
either RESET is driven active or a data byte is
written to the DBBIN register by a master CPU,
this mode will be exited (as above). However,
as the oscillator cell will require an initialization
time, either RESET must be held active for
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