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參數(shù)資料
| 型號(hào)： | GMS90C31 |
| 英文描述： | 8-Bit CMOS Microcontrollers(高性價(jià)比的51單片機(jī)，片內(nèi)無(wú)ROM,128字節(jié)RAM,工作電壓5V) |
| 中文描述： | 8位CMOS微控制器（高性價(jià)比的51單片機(jī)，片內(nèi)無(wú)光盤(pán)，128字節(jié)的RAM，工作電壓5V的） |
| 文件頁(yè)數(shù)： | 10/59頁(yè) |
| 文件大小： | 812K |
| 代理商： | GMS90C31 |
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Symbol
Pin Number
P-DIP-40
Input/
Output
Function
P-LCC-44
P-MQFP-44
XTAL1
21
19
15
I
XTAL1
Input to the inverting oscillator amplifier and input to
the internal clock generator circuits.
To drive the device from an external clock source,
XTAL1 should be driven, while XTAL2 is left
unconnected. There are no requirements on the duty
cycle of the external clock signal, since the input to the
internal clocking circuitry is divided down by a
divide-by-two flip-flop. Minimum and maximum high
and low times as well as rise fall times specified in the
AC characteristics must be observed.
Port 2
Port 2 is an 8-bit bidirectional I/O port with internal
pull-ups. Port 2 pins that have 1s written to them are
pulled high by the internal pull-up resistors and can be
used as inputs. As inputs, port 2 pins that are
externally pulled low will source current because of the
pulls-ups (
I
IL
, in the DC characteristics).Port 2 emits
the high-order address byte during fetches from
external program memory and during accesses to
external data memory that use 16-bit
addresses(MOVX @DPTR). In this application it uses
strong internal pull-ups when emitting 1s. During
accesses to external data memory that use 8-bit
addresses (MOVX @Ri), port 2 emits the contents of
the P2 special function register.
The Program Store Enable
The read strobe to external program memory when the
device is executing code from the external program
memory. PSEN is activated twice each machine cycle,
except that two PSEN activations are skipped during
each access to external data memory. PSEN is not
activated during fetches from internal program
memory.
RESET
A high level on this pin for two machine cycles while
the oscillator is running resets the device. An internal
diffused resistor to
V
SS
permits power-on reset using
only an external capacitor to
V
CC.
P2.0 - P2.7
24-31
21-28
18-25
I/O
PSEN
32
29
26
O
RESET
10
9
4
I
GMS90 Series
8-Bit CMOS Microcontroller
LG Semicon MCU
10
MAY. 1998
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參數(shù)描述 |
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