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參數(shù)資料
| 型號(hào)： | MC68HC08LT8CFGE |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | 10 X 10 MM, 1.40 MM THICKNESS, 0.80 MM PITCH, ROHS COMPLIANT, MS-026BCB, LQFP-44 |
| 文件頁(yè)數(shù)： | 117/156頁(yè) |
| 文件大小： | 1107K |
| 代理商： | MC68HC08LT8CFGE |
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I/O Signals
MC68HC08LT8 Data Sheet, Rev. 1
Freescale Semiconductor
63
To allow software to clear status bits during a break interrupt, write a logic 1 to the BCFE bit. If a status
bit is cleared during the break state, it remains cleared when the MCU exits the break state.
To protect status bits during the break state, write a logic 0 to the BCFE bit. With BCFE at logic 0 (its
default state), software can read and write I/O registers during the break state without affecting status bits.
Some status bits have a 2-step read/write clearing procedure. If software does the first step on such a bit
before the break, the bit cannot change during the break state as long as BCFE is at logic 0. After the
break, doing the second step clears the status bit.
6.8 I/O Signals
Port B shares four of its pins with the TIM. The four TIM channel I/O pins are T1CH0, T1CH1, T2CH0,
and T2CH1 as described in 6.3 Pin Name Conventions.
Each channel I/O pin is programmable independently as an input capture pin or an output compare pin.
T1CH0 and T2CH0 can be configured as buffered output compare or buffered PWM pins.
6.9 I/O Registers
NOTE
References to either timer 1 or timer 2 may be made in the following text by
omitting the timer number. For example, TSC may generically refer to both
T1SC AND T2SC.
These I/O registers control and monitor operation of the TIM:
TIM status and control register (TSC)
TIM counter registers (TCNTH:TCNTL)
TIM counter modulo registers (TMODH:TMODL)
TIM channel status and control registers (TSC0, TSC1)
TIM channel registers (TCH0H:TCH0L, TCH1H:TCH1L)
6.9.1 TIM Status and Control Register
The TIM status and control register (TSC):
Enables TIM overflow interrupts
Flags TIM overflows
Stops the TIM counter
Resets the TIM counter
Prescales the TIM counter clock
Address: T1SC, $0020 and T2SC, $002B
Bit 7
654321
Bit 0
Read:
TOF
TOIE
TSTOP
00
PS2
PS1
PS0
Write:
0
TRST
Reset:
00100000
= Unimplemented
Figure 6-4. TIM Status and Control Register (TSC)
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