MC68HC12 MOTOROLA [Motorola, Inc], MC68HC12 Datasheet - Page 268
MC68HC12
Manufacturer Part Number
MC68HC12
Description
The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC12.pdf
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ICSYS — Input Control System Control Register
Enhanced Capture Timer
Technical Data
268
RESET:
SH37
BIT 7
0
SH26
6
0
An IC register is empty when it has been read or latched into the holding
register.
A holding register is empty when it has been read.
NOVWx — No Input Capture Overwrite
Read: any time
Write: May be written once (SMODN=1). Writes are always permitted
when SMODN=0.
SHxy — Share Input action of Input Capture Channels x and y
TFMOD — Timer Flag-setting Mode
Use of the TFMOD bit in the ICSYS register ($AB) in conjunction with
the use of the ICOVW register ($AA) allows a timer interrupt to be
generated after capturing two values in the capture and holding
registers instead of generating an interrupt for every capture.
By setting TFMOD in queue mode, when NOVW bit is set and the
corresponding capture and holding registers are emptied, an input
capture event will first update the related input capture register with
0 = The contents of the related capture register or holding register
1 = The related capture register or holding register cannot be
0 = Normal operation
1 = The channel input ‘x’ causes the same action on the channel
SH15
5
0
can be overwritten when a new input capture or latch occurs.
written by an event unless they are empty (see
This will prevent the captured value to be overwritten until it is
read or latched in the holding register.
‘y’. The port pin ‘x’ and the corresponding edge detector is
used to be active on the channel ‘y’.
Enhanced Capture Timer
SH04
4
0
TFMOD
3
0
PACMX
2
0
MC68HC912DT128A — Rev 4.0
BUFEN
1
0
LATQ
BIT 0
0
IC
Channels).
MOTOROLA
$00AB
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