參數(shù)資料
型號: ST90158
廠商: 意法半導(dǎo)體
英文描述: 8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM
中文描述: 微控制器16位產(chǎn)品的家庭多達(dá)64K的ROM /檢察官/ EPROM和2K的內(nèi)存
文件頁數(shù): 10/190頁
文件大?。?/td> 1152K
代理商: ST90158
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ST90158 - GENERAL DESCRIPTION
9
1.2 PIN DESCRIPTION
AS
: Address Strobe (output, active low, 3-state).
Address Strobe is pulsed low once at the begin-
ning of each memory cycle. The rising edge of AS
indicates that address, Read/Write (R/W), and
Data Memory signals are valid for memory trans-
fers. Underprogram control, AS canbe placed in a
high-impedance state along with Port 0, Port 1and
Data Strobe (DS).
DS
: Data Strobe (output, activelow, 3-state). Data
Strobe provides thetiming for data movement to or
from Port 0 for each memory transfer. During a
write cycle, data out is valid at the leading edge of
DS. During a read cycle, Data In must be valid pri-
or to the trailing edge of DS. When the ST90158
accesses on-chip memory, DS is held high during
the whole memory cycle. It can be placed in a high
impedance state along with Port 0, Port 1 and AS.
RESET
: Reset (input, active low). The ST9+ is ini-
tialised by the Reset signal. With the deactivation
of RESET, program execution begins from the
memory location pointed to by the vector con-
tained in memory locations 00h and 01h.
R/W
: Read/Write (output, 3-state). Read/Write de-
termines the direction of data transfer for external
memory transactions. R/W is low when writing to
external memory, and high for all other transac-
tions. It can be placed in high impedance state
along with Port 0, Port 1, AS and DS.
OSCIN, OSCOUT
: Oscillator (input and output).
These pins connect a parallel-resonant crystal (3
to 5 MHz), or an external source to the on-chip
clock oscillator and buffer. OSCIN is the input of
the oscillator inverter and internal clock generator;
OSCOUT is the output of the oscillator inverter.
HW0_SW1:
When connectedto V
DD
through a 1K
pull-up resistor, the software watchdog option is
selected. When connected to V
SS
through a 1K
pull-down resistor, the hardware watchdog option
is selected.
V
PP
:
Programming voltage for EPROM/OTP de-
vices. Must be connected to V
SS
in user mode
through a 10 Kohm resistor.
AV
DD
: Analog V
DD
of the Analog to Digital Con-
verter.
AV
SS
: Analog V
SS
of the Analog to Digital Con-
verter.
V
DD
: Main Power Supply Voltage (5V
±
10%).
V
SS
: Digital Circuit Ground.
P0[7:0], P1[7:0]:
(Input/Output TTL or CMOS
compatible). 16 lines grouped into I/O ports provid-
ing the external memory interface for addressing
64Kbytes of external memory.
P0[7:0], P1[7:0], P2[6:0], P4[7:0], P5[7:3], P5.1,
P6[6:0], P7[7:0], P8[7:0], P9[7:4], P9[2:0]:
I/O
Port Lines (Input/Output, TTL or CMOS compati-
ble). I/O lines grouped into I/O ports of 8 bits, bit
programmable under program control as general
purpose I/O or as alternate functions.
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