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參數(shù)資料
| 型號： | MC68HC05C9AMFN |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 69/124頁 |
| 文件大?。?/td> | 774K |
| 代理商： | MC68HC05C9AMFN |
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Timer I/O Registers
MC68HC05C9A Advance Information Data Sheet, Rev. 5.1
Freescale Semiconductor
49
8.3.3 Timer Registers
The timer registers (TRH and TRL), shown in Figure 8-4, contain the current high and low bytes of the
16-bit counter. Reading TRH before reading TRL causes TRL to be latched until TRL is read. Reading
TRL after reading the timer status register clears the timer overflow flag (TOF). Writing to the timer
registers has no effect.
8.3.4 Alternate Timer Registers
The alternate timer registers (ATRH and ATRL), shown in Figure 8-5, contain the current high and low
bytes of the 16-bit counter. Reading ATRH before reading ATRL causes ATRL to be latched until ATRL
is read. Reading ATRL has no effect on the timer overflow flag (TOF). Writing to the alternate timer
registers has no effect.
Figure 8-5. Alternate Timer Registers (ATRH and ATRL)
NOTE
To prevent interrupts from occurring between readings of ATRH and ATRL,
set the interrupt flag in the condition code register before reading ATRH,
and clear the flag after reading ATRL.
Address:
$0018 — TRH
Bit 7
654321
Bit 0
Read:
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Write
Reset:
11111111
Address:
$0019 — TRL
Bit 7
654321
Bit 0
Read:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Write:
Reset:
11111100
= Unimplemented
Figure 8-4. Timer Registers (TRH and TRL)
Address:
$001A — ATRH
654321
Bit 0
Read:
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Write:
Reset:
11111111
Address:
$001B — ATRL
Bit 7
654321
Bit 0
Read:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Write:
Reset:
11111100
= Unimplemented
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC05C9AMP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC05C9AP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC05C9CP | 制造商:Motorola Inc 功能描述:IC UP HCMOS 68HC05C9CP DIP40 0 |
| MC68HC05C9E | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC05C9ECFB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
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