參數(shù)資料
型號: MC68HC705PD6
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 148/165頁
文件大小: 841K
代理商: MC68HC705PD6
July 7, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05PD6
TIMER SYSTEM
MOTOROLA
REV 1.1
9-11
OLVL
The value of the output level (OLVL) bit is clocked into the output level register
by the next successful output compare and will appear at TCMP pin. This bit
and the output level register are cleared by reset.
0 =
low output
1 =
high output
9.1.5 Timer Status Register (TSR)
The timer status register is a read-only register and is illustrated below followed by
a denition of each bit. Refer to timing diagrams shown in Figure 9-3, Figure 9-4
and Figure 9-5 for timing relationship to the timer status register bits.
ICF
The input capture ag (ICF) is set when a proper edge has been sensed by the
input capture edge detector. It is cleared by a processor access of the timer
status register (with ICF set) followed by accessing the low byte ($15) of the
input capture register. Reset does not affect the input compare ag.
OC1F
The output compare ag (OC1F) is set when the output compare register
contents matches the contents of the free running counter. The OC1F is
cleared by accessing the timer status register (with OC1F set) and then
accessing the low byte ($17) of the output compare register. Reset does not
affect the output compare ag.
TOF
The timer overow ag (TOF) bit is set by transition of the free run from $FFFF
to $0000. It is cleared by accessing the timer status register (with TOF set)
followed by an access of the free running counter least signicant byte ($19).
Reset does not affect the TOF bit.
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
X
7
X
00000
6543210
0
TOF
OC1F
ICF
W
R
TSR
$0013
reset
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