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PDF ( 数据手册 , 数据表 ) ST62T18C

零件编号 ST62T18C
描述 8-BIT MCUs WITH A/D CONVERTER
制造商 ST Microelectronics
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ST62T18C 数据手册, 描述, 功能
ST62T18C/E18C
8-BIT MCUs WITH A/D CONVERTER, AUTO-RELOAD
TIMER, UART, OSG, SAFE RESET AND 20-PIN PACKAGE
s 3.0 to 6.0V Supply Operating Range
s 8 MHz Maximum Clock Frequency
s -40 to +125°C Operating Temperature Range
s Run, Wait and Stop Modes
s 5 Interrupt Vectors
s Look-up Table capability in Program Memory
s Data Storage in Program Memory:
User selectable size
s Data RAM: 192 bytes
s User Programmable Options
s 12 I/O pins, fully programmable as:
– Input with pull-up resistor
– Input without pull-up resistor
– Input with interrupt generation
– Open-drain or push-pull output
– Analog Input
s 5 I/O lines can sink up to 20mA to drive LEDs or
TRIACs directly
s 8-bit Timer/Counter with 7-bit programmable
prescaler
s 8-bit Auto-reload Timer with 7-bit programmable
prescaler (AR Timer)
s Digital Watchdog
s 8-bit A/D Converter with 7 analog inputs
s 8-bit Asynchronous Peripheral Interface
(UART)
s On-chip Clock oscillator can be driven by Quartz
Crystal or Ceramic resonator
s Oscillator Safe Guard
s Low Voltage Detector for safe Reset
s One external Non-Maskable Interrupt
s ST623x-EMU2 Emulation and Development
System (connects to an MS-DOS PC via a
parallel port).
DEVICE SUMMARY
DEVICE
ST62T18C
ST62E18C
OTP
(Bytes)
7948
EPROM
(Bytes)
-
7948
I/O Pins
12
12
PDIP20
PSO20
CDIP20W
(See end of Datasheet for Ordering Information)
November 1999
Rev. 2.5
1/82
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ST62T18C pdf, 数据表
ST62T18C/E18C
1.3 MEMORY MAP
1.3.1 Introduction
The MCU operates in three separate memory
spaces: Program space, Data space, and Stack
space. Operation in these three memory spaces is
described in the following paragraphs.
Briefly, Program space contains user program
code in Program memory and user vectors; Data
space contains user data in RAM and in Program
memory, and Stack space accommodates six lev-
els of stack for subroutine and interrupt service
routine nesting.
1.3.2 Program Space
Program Space comprises the instructions to be
executed, the data required for immediate ad-
dressing mode instructions, the reserved factory
test area and the user vectors. Program Space is
addressed via the 12-bit Program Counter register
(PC register).
Program Space is organised in 4K pages. 4 of
them are addressed in the 000h-7FFh locations of
the Program Space by the Program Counter and
by writing the appropriate code in the Program
ROM Page Register (PRPR register). A common
Figure 4. Memory Addressing Diagram
(STATIC) 2K page is available all the time for inter-
rupt vectors and common subroutines, independ-
ently of the PRPR register content. This “STATIC”
page is directly addressed in the 0800h-0FFFh by
the MSB of the Program Counter register PC 11.
Note this page can also be addressed in the 000-
7FFh range. It is two different ways of addressing
the same physical memory.
Jump from a dynamic page to another dynamic
page is achieved by jumping back to the static
page, changing contents of PRPR and then jump-
ing to the new dynamic page.
Figure 3. 8Kbytes Program Space Addressing
PC
SPACE 0000h
000h
7FFh
Page 0
800h
FFFh
Page 1
Static
Page
ROM SPACE
Page 1
St atic
Page
Page 2
1FFFh
Page 3
PROGRAM SPACE
DATA SPACE
0000h
PROGRAM
MEMORY
0FF0h
0FFFh
INTERRUPT &
RESET VECTORS
0-63
000h
RAM / EEPROM
BANKING AREA
03Fh
040h
07Fh
080h
081h
082h
083h
084h
DATA READ-ONLY
MEMORY WINDOW
X REGISTER
Y REGISTER
V REGISTER
W REGISTER
RAM
0C0h
0FFh
DATA READ-ONLY
MEMORY
WINDOW SELECT
DATA RAM
BANK SELECT
ACCUMULATOR
VR01568
8/82
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ST62T18C equivalent, schematic
ST62T18C/E18C
3 CLOCKS, RESET, INTERRUPTS AND POWER SAVING MODES
3.1 CLOCK SYSTEM
The MCU features a Main Oscillator which can be
driven by an external clock, or used in conjunction
with an AT-cut parallel resonant crystal or a suita-
ble ceramic resonator, or with an external resistor
(RNET). In addition, a Low Frequency Auxiliary Os-
cillator (LFAO) can be switched in for security rea-
sons, to reduce power consumption, or to offer the
benefits of a back-up clock system.
The Oscillator Safeguard (OSG) option filters
spikes from the oscillator lines, provides access to
the LFAO to provide a backup oscillator in the
event of main oscillator failure and also automati-
cally limits the internal clock frequency (fINT) as a
function of VDD, in order to guarantee correct oper-
ation. These functions are illustrated in Figure 2,
Figure 3, Figure 4 and Figure 5.
Figure 1 illustrates various possible oscillator con-
figurations using an external crystal or ceramic res-
onator, an external clock input, an external resistor
(RNET), or the lowest cost solution using only the
LFAO. CL1 an CL2 should have a capacitance in the
range 12 tST6_CLK1o 22 pF for an oscillator fre-
quency in the 4-8 MHz range.
The internal MCU clock frequency (fINT) is divided
by 12 to drive the Timer, the A/D converter and the
Watchdog timer, and by 13 to drive the CPU core,
as may be seen in Figure 4.
With an 8MHz oscillator frequency, the fastest ma-
chine cycle is therefore 1.625µs.
A machine cycle is the smallest unit of time needed
to execute any operation (for instance, to increment
the Program Counter). An instruction may require
two, four, or five machine cycles for execution.
3.1.1 Main Oscillator
The oscillator configuration may be specified by se-
lecting theappropriate option.When the CRYSTAL/
RESONATORoption isselected, itmustbeusedwith
a quartz crystal, a ceramic resonator or an external
signal providedonthe OSCinpin.When theRC NET-
WORK option is selected, the system clock is gen-
erated by an external resistor.
The main oscillator can be turned off (when the
OSG ENABLED option is selected) by setting the
OSCOFF bit of the ADC Control Register. The
Low Frequency Auxiliary Oscillator is automatical-
ly started.
Figure 8. Oscillator Configurations
CRYSTAL/RES ONATOR CLOCK
CRYSTAL/RESON ATOR option
ST6xxx
OSCin
OSCout
CL1n
CL2
EXTERNAL CLOCK
CRYSTAL/RESON ATOR option
ST6xxx
OSCin
OSCout
NC
RC NETW ORK
RC NETW ORK option
ST6xxx
OSCin
NC
OSCout
RNET
INTEGRA TED CLOCK
CRYSTAL/RESON ATOR option
OSG ENABLED option
ST6xxx
OSCin
OSCout
NC
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