- 您现在的位置：买卖IC网 > PDF目录98144 > ST72141K2B3/XXX (STMICROELECTRONICS) 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 PDF资料下载
参数资料
| 型号： | ST72141K2B3/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| 封装： | 0.400 INCH, PLASTIC, SDIP-32 |
| 文件页数： | 86/133页 |
| 文件大小： | 2615K |
| 代理商： | ST72141K2B3/XXX |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页当前第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页第121页第122页第123页第124页第125页第126页第127页第128页第129页第130页第131页第132页第133页
Obsolete
Product(s)
- Obsolete
Product(s)
ST72141K2
56/133
MOTOR CONTROLLER (Cont’d)
Autoswitched Mode
In this mode the MCOMP register content is auto-
matically computed in real time as described be-
low and in Figure 35. This register is READ ONLY.
The C event has no effect on the contents of the
MTIM timer.
When a Z event occurs the MTIM timer value is
captured in the MZREG register, the previous cap-
tured value is shifted into the MZPRV register and
the MTIM timer is reset. See Figure 26.
One of these two registers (depending on the DCB
bit in the MCRA register) is multiplied with the con-
tents of the MWGHT register and divided by 32.
The result is loaded in the MCOMP compare reg-
ister, which automatically triggers the next com-
mutation (C event)
Table 19. Multiplier Result
When an overflow occurs during the multiply oper-
ation, FFh is written in the MCOMP register and an
interrupt (O event) is generated if enabled by the
OIM bit in the MIMR register.
Figure 35. Commutation Processor Block
When the timer reaches this value an RPI interrupt
is generated (timer overflow).
After each shift operation the multiply is recomput-
ed for greater precision.
Using either the MZREG or MZPRV register de-
pends on the motor symmetry and type.
The MWGHT register gives directly the phase shift
between the motor driven voltage and the BEMF.
This parameter generally depends on the motor
and on the speed.
Auto-updated Step Ratio Register: In switched
mode, the MTIM timer is driven by software only
and any prescaler change has to be done by soft-
ware (see Section 8.1.4.2 for more details).
– In autoswitched mode an auto-updated prescal-
er always configures the MTIM timer for best ac-
curacy. Figure 34 shows process of updating the
Step Ratio bits:
– When the MTIM timer value reaches FFh, the pr-
escaler is automatically incremented in order to
slow down the MTIM timer and avoid an over-
flow. To keep consistent values, the MTIM regis-
ter and all the relevant registers are shifted right
(divided by two). The RPI bit in the MISR register
is set and an interrupt is generated (if RIM is set).
– When a Z-event occurs, if the MTIM timer value
is below 55h, the prescaler is automatically dec-
remented in order to speed up the MTIM timer
and keep precision better than 1.2%. The MTIM
register and all the relevant registers are shifted
left (multiplied by two). The RMI bit in the MISR
register is set and an interrupt is generated if RIM
is set.
– If the prescaler contents reach the value 0, it can
no longer be automatically decremented, the
MTC continues working with the same prescaler
value, i.e. with a lower accuracy. No RMI in-
terrrupt can be generated.
– If the prescaler contents reach the value 15, it
can no longer be automatically incremented.
When the timer reaches the value FFh, the pres-
caler and all the relevant registers remain un-
changed and no interrupt is generated, the timer
clock is disabled, and its contents stay at FFh
The PWM is still generated and the D and Z de-
tection circuitry still work, enabling the capture of
the maximum timer value.
The automatically updated registers are: MTIM,
MZREG, MZPRV, MCOMP and MDREG. Access
to these registers is summarised in Table 22.
DCB bit
Commutation Delay
0
MCOMP = MWGHT x MZPRV / 32
1
MCOMP = MWGHT x MZREG / 32
MWGHT [an+1]
MZREG [Zn]
§
A x B / 32
MZPRV [Zn-1]
§
3
DCB bit
SWA bit
MCOMP [Cn+1]
§
Z
set
8
n
n-1
O
To
§ = Register updated on R event
generator
interrupt
MCRA Register
相关PDF资料 |
PDF描述 |
|---|---|
| ST72311N4T6/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64 |
| ST72311J2B6/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| ST72311N2T3/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64 |
| ST72321BAR7T6 | MICROCONTROLLER, QFP64 |
| ST72321BR7T3 | MICROCONTROLLER, QFP64 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST72141K2B6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH ELECTRIC-MOTOR CONTROL, ADC, 16-BIT TIMERS, SPI INTERFACE |
| ST72141K2M1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH ELECTRIC-MOTOR CONTROL, ADC, 16-BIT TIMERS, SPI INTERFACE |
| ST72141K2M3 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH ELECTRIC-MOTOR CONTROL, ADC, 16-BIT TIMERS, SPI INTERFACE |
| ST72141K2M3/XXX | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| ST72141K2M6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH ELECTRIC-MOTOR CONTROL, ADC, 16-BIT TIMERS, SPI INTERFACE |
发布紧急采购，3分钟左右您将得到回复。