參數(shù)資料
型號： MC68HC705JB2DW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDSO20
封裝： SOIC-20
文件頁數(shù)： 82/128頁
文件大?。?/td> 2493K
代理商： MC68HC705JB2DW
August 28, 1998
GENERAL RELEASE SPECIFICATION
MULTI-FUNCTION TIMER
REV 1.1
8-3
8.1.2 Timer Control/Status Register (TCSR) $08
The TCSR contains the timer interrupt ag bits, the timer interrupt enable bits, and
the real time interrupt rate select bits. Bit 2 and bit 3 are write-only bits which will
read as logical zeros. Figure 8-3 shows the value of each bit in the TCSR
following reset.
Figure 8-3. Timer Control/Status Register (TCSR)
TOF - Timer Overow Flag
The TOF is a read-only ag bit.
1 =
Set when the 8-bit ripple counter rolls over from $FF to $00. A
TIMER Interrupt request will be generated if TOFE is also set.
0 =
Reset by writing a logical one to the TOF acknowledge bit, TOFR.
Writing to the TOF ag bit has no effect on its value. This bit is
cleared by reset.
RTIF - Real Time Interrupt Flag
The RTIF is a read-only ag bit.
1 =
Set when the output of the chosen (1 of 4 selections) Real Time
Interrupt stage goes active. A TIMER Interrupt request will be
generated if RTIE is also set.
0 =
Reset by writing a logical one to the RTIF acknowledge bit, RTIFR.
Writing to the RTIF ag bit has no effect on its value. This bit is
cleared by reset.
TOFE - Timer Overow Enable
The TOFE is an enable bit that allows generation of a TIMER Interrupt upon
overow of the Timer Counter Register.
1 =
When set, the TIMER Interrupt is generated when the TOF ag bit is
set.
0 =
When cleared, no TIMER interrupt caused by TOF bit set will be
generated. This bit is cleared by reset.
RTIE - Real Time Interrupt Enable
The RTIE is an enable bit that allows generation of a TIMER Interrupt by the
RTIF bit.
1 =
When set, the TIMER Interrupt is generated when the RTIF ag bit is
set.
0 =
When cleared, no TIMER interrupt caused by RTIF bit set will be
generated. This bit is cleared by reset.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TCSR
R
TOF
RTIF
TOFE
RTIE
00
RT1
RT0
$0008
W
TOFR
RTIFR
reset:
00000011
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)PDF資料
PDF描述
MC68HC705JB2P 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP20
MC68HC705JB4P 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP28
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