MC912DG128A Motorola, MC912DG128A Datasheet - Page 216
MC912DG128A
Manufacturer Part Number
MC912DG128A
Description
Microcontrollers
Manufacturer
Motorola
Datasheet
1.MC912DG128A.pdf
(404 pages)
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PORTT — Timer Port Data Register
TIMTST — Timer Test Register
Enhanced Capture Timer
MC68HC912DT128A Rev 2.0
216
RESET:
RESET:
TIMER
PORT
I/OC7
BIT 7
BIT 7
PT7
0
0
-
I/OC6
PT6
6
6
0
0
-
Read: any time
Write: only in special mode (SMOD = 1).
TCBYP — Main Timer Divider Chain Bypass
Read: any time (inputs return pin level; outputs return data register
contents)
0 = Queue Mode of Input Capture is enabled.
1 = Latch Mode is enabled. Latching function occurs when
0 = Normal operation
1 = For testing only. The 16-bit free-running timer counter is divided
I/OC5
PT5
5
5
0
0
-
The main timer value is memorized in the IC register by a valid
input pin transition.
With a new occurrence of a capture, the value of the IC register
will be transferred to its holding register and the IC register
memorizes the new timer value.
modulus down-counter reaches zero or a zero is written into
the count register MCCNT (see
With a latching event the contents of IC registers and 8-bit
pulse accumulators are transferred to their holding registers.
8-bit pulse accumulators are cleared.
into two 8-bit halves and the prescaler is bypassed. The clock
drives both halves directly.
When the high byte of timer counter TCNT ($84) overflows
from $FF to $00, the TOF flag in TFLG2 ($8F) will be set.
Enhanced Capture Timer
I/OC4
PT4
4
0
0
4
-
I/OC3
PT3
3
0
0
3
-
I/OC2
PT2
2
0
0
2
-
Buffered IC
TCBYP
I/OC1
PT1
1
0
1
-
Channels).
BIT 0
I/OC0
BIT 0
PT0
0
0
-
MOTOROLA
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