參數(shù)資料
型號: MC68HC05PD6
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, PQFP80
封裝: PLASTIC, TQFP-80
文件頁數(shù): 147/165頁
文件大小: 841K
代理商: MC68HC05PD6
GENERAL RELEASE SPECIFICATION
July 7, 1997
MOTOROLA
TIMER SYSTEM
MC68HC05PD6
9-10
REV 1.1
9.1.4 Timer Control Register (TCR)
The TCR is a read/write register containing six control bits. Three bits control
interrupts associated with each of the three ag bits found in the timer status
register. The other two bits control: 1) which edge is signicant to the input capture
edge detector (i.e., negative or positive), and 2) the next value to be clocked to the
output level register in response to a successful output compare. The timer control
register and the free running counter are the only sections of the timer affected by
reset. The TCMP pin is forced low during external reset and stays low until a valid
compare changes it to high. The timer control register is illustrated below by a
denition of each bit.
ICIE
If the input capture interrupt enable (ICIE) bit is set, a timer interrupt is enable
when the ICF status ag is set, provided the I bit in CCR is cleared. If the ICIE
bit is cleared, the interrupt is inhibited. The ICIE bit is cleared by reset.
OC1IE
If the output compare interrupt enable (OC1IE) bit is set, a timer interrupt is
enabled whenever the OC1F status ag is set, provided the I bit in CCR is
cleared. If the OC1IE bit is cleared, the interrupt is inhibited. The OC1IE bit is
cleared by reset.
TOIE
If the timer overow interrupt enable (TOIE) bit is set, a timer interrupt is
enabled whenever the TOF status ag is set, provided the I bit in CCR is
cleared. If the TOIE bit is cleared, the interrupt
is inhibited. The TOIE bit is
cleared by reset.
OE1
The OE1 bit congures whether Port C bit 2 as I/O pin or as output pin of
TCMP.
0 =
PC2 is selected
1 =
TCMP is selected
IEDG
The value of the input edge (IEDG) bit determines which level transition on
TCAP pin will trigger a free running counter transfer to the input capture
register. Reset does not affect the IEDG bit.
0 =
negative edge
1 =
positive edge
0
ICIE
0
7
IEDG
00000
X
0
6543210
OE1
0
OLVL
W
R
TCR
$0012
reset
TOIE
OC1IE
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