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參數(shù)資料
| 型號： | MC68HC05JB4DWR2 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 97/134頁 |
| 文件大?。?/td> | 1305K |
| 代理商： | MC68HC05JB4DWR2 |
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February 24, 1999
GENERAL RELEASE SPECIFICATION
MC68HC05JB4
16-BIT TIMER
MOTOROLA
REV 2
9-9
IEDG - INPUT CAPTURE EDGE SELECT
The state of this read/write bit determines whether a positive or negative transi-
tion on the ICAP1 pin triggers a transfer of the contents of the timer register to
the input capture register. Reset has no effect on the IEDG bit.
1 =
Positive edge (low to high transition) triggers input capture.
0 =
Negative edge (high to low transition) triggers input capture.
9.6
TIMER STATUS REGISTER (TSR)
The timer status register (TSR) shown in Figure 9-11 contains ags for the follow-
ing events:
An active signal on the PB0/ICAP1 pin, transferring the contents of the
timer registers to the input capture registers.
A match between the 16-bit counter and the output compare registers
An overow of the timer registers from $FFFF to $0000.
Writing to any of the bits in the TSR has no effect. Reset does not change the
state of any of the ag bits in the TSR.
ICF - INPUT CAPTURE FLAG
The ICF bit is automatically set when an edge of the selected polarity occurs on
the PB0/ICAP1 pin. Clear the ICF bit by reading the timer status register with
the ICF set, and then reading the low byte (ICRL, $0015) of the input capture
registers. Reset has no effect on ICF.
OCF - OUTPUT COMPARE FLAG
The OCF bit is automatically set when the value of the timer registers matches
the contents of the output compare registers. Clear the OCF bit by reading the
timer status register with the OCF set, and then accessing the low byte (OCRL,
$0017) of the output compare registers. Reset has no effect on OCF.
TOF - TIMER OVERFLOW FLAG
The TOF bit is automatically set when the 16-bit timer counter rolls over from
$FFFF to $0000. Clear the TOF bit by reading the timer status register with the
TOF set, and then accessing the low byte (TMRL, $0019) of the timer registers.
Reset has no effect on TOF.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TSR
R
ICF
OCF
TOF
00000
$0013
W
reset:
U
00000
U = UNAFFECTED BY RESET
Figure 9-11. Timer Status Registers (TSR)
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