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| 型号： | MC68HC05P9AVDW |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28 |
| 封装： | SOIC-28 |
| 文件页数： | 46/90页 |
| 文件大小： | 285K |
| 代理商： | MC68HC05P9AVDW |
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GENERAL RELEASE SPECIFICATION
MOTOROLA
TIMER
MC68HC05P9A
8-6
Rev. 2.0
8.5
Timer Status Register (TSR) $13
The TSR is a read-only register containing three status ag bits.
ICF — Input Capture Flag
1 =
Flag set when selected polarity edge is sensed by input capture
edge detector
0 =
Flag cleared when TSR and input capture low register ($15) are
accessed
OCF — Output Compare Flag
1 =
Flag set when output compare register contents match the free-
running counter contents
0 =
Flag cleared when TSR and output compare low register ($17) are
accessed
TOF — Timer Overow Flag
1 =
Flag set when free-running counter transition from $FFFF to $0000
occurs
0 =
Flag cleared when TSR and counter low register ($19) are accessed
Bits 0-4 — Not used
Always read zero
Accessing the timer status register satises the rst condition required to clear
status bits. The remaining step is to access the register corresponding to the
status bit.
A problem can occur when using the timer overow function and reading the free-
running counter at random times to measure an elapsed time.
Without
incorporating the proper precautions into software, the timer overow ag could
unintentionally be cleared if:
1.
The timer status register is read or written when TOF is set, and
2.
The LSB of the free-running counter is read but not for the purpose of
servicing the ag.
The counter alternate register at address $1A and $1B contains the same value
as the free-running counter (at address $18 and $19); therefore, this alternate
register can be read at any time without affecting the timer overow ag in the
timer status register.
$13
ICF
OCF
TOF
00000
RESET:
U
00000
Figure 8-3. Timer Status Register
相关PDF资料 |
PDF描述 |
|---|---|
| MC68HC05P9AVP | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28 |
| MC68HC05P9AP | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28 |
| MC68HC05P9ACDW | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28 |
| MC68HC05P9P | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28 |
| MC68HC05P9CDW | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC68HC05P9AVP | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05P9DW | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
| MC68HC05P9P | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
| MC68HC05PV8 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Techinal Data - rev 1.9 |
| MC68HC05PV8A | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Techinal Data - rev 1.9 |
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