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| 型号： | EM6617TP28A |
| 英文描述： | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0°C to 70°C; Package: 8-EPSOIC T&R |
| 中文描述： | 微控制器 |
| 文件页数： | 16/67页 |
| 文件大小： | 824K |
| 代理商： | EM6617TP28A |
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EM6617
03/02 REV. C/442
Copyright
2002, EM Microelectronic-Marin SA
23
www.emmicroelectronic.com
8. 10-bit Counter
The EM6617 has a built-in universal cyclic counter. It can be configured as 10, 8, 6 or 4-bit counter. If 10-bits
are selected we call that full bit counting, if 8, 6 or 4-bits are selected we call that limited bit counting.
The counter works in up- or down count mode. Eight clocks can be used as the input clock source, six of them
are derived prescaler frequencies and two are coming from the input pads PA[0] and PA[3]. In this case the
counter can be used as an event counter.
The counter generates an interrupt request IRQCount0 every time it reaches 0 in down count mode or 3FF in
up count mode. Another interrupt request IRQCntComp is generated in compare mode whenever the counter
value matches the compare data register value. Each of this interrupt requests can be masked (default). See
section 13 for more information about the interrupt handling.
A 10-bit data register CReg[9:0] is used to initialize the counter at a specific value (load into Count[9:0]). This
data register (CReg[9:0]) is also used to compare its value against Count[9:0] for equivalence.
A Pulse-Width-Modulation signal (PWM) can be generated and output on port B terminal PB[3].
8.1 Full and Limited Bit Counting
In Full Bit Counting mode the counter uses its maximum
of 10-bits length (default ). With the BitSel[1,0] bits in
register RegCDataH one can lower the counter length,
for IRQ generation, to 8, 6 or 4 bits. This means that
actually the counter always uses all the 10-bits, but
IRQCount0 generation is only performed on the number
of selected bits. The unused counter bits may or may not be taken into account for the IRQComp generation
depending on bit SelIntFull. Refer to chapter 8.4.
Figure 17. 10-bit Counter Block Diagram
En
Comparator
ck
Up/Down
Up/Down Counter
En
EvCount
Counter Read Register
RegCDataL, M, H
(Count[9:0])
RegCDataL, M, H (CReg[9:0])
Load
IRQCntComp
PWM
IRQCount0
Data Register
DB[3:0]
PA[0]
Ck[15]
Ck[12]
Ck[10]
Ck[8]
Ck[4]
Ck[1]
PA[3]
ck
MUX
RegCCntl1, 2
CountFSel2...0
Up/Down
Start
EvCount
Load
EnComp
Table 7.7.1. Counter length selection
BitSel[1]
BitSel[0 ]
counter length
0
10-Bit
01
8-Bit
10
6-Bit
11
4-Bit
相关PDF资料 |
PDF描述 |
|---|---|
| EM6617TP28B | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 8-EPSOIC T&R |
| EM6640SO18A | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 8-SOIC |
| EM6640SO18B | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 10-DFN |
| EM6640TP16A | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 10-DFN |
| EM6640TP16B | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0°C to 70°C; Package: 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EM6617TP28B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
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| EM6617WP27 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power Microcontroller with ADC AND EEPROM |
| EM6617WS11 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power Microcontroller with ADC AND EEPROM |
| EM6617WS27 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power Microcontroller with ADC AND EEPROM |
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