|
MC68HC05T16 Datasheet, PDF (41/128 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit | |||
|
◁ |
VFLB - VFLBK status
1 (set) â Vertical ï¬yback (leading edge) signal detected.
0 (clear) â No Vertical ï¬yback signal detected.
RiCF - Row i display status
1 (set) â Row i display has been terminated.
0 (clear) â Row i display has been not terminated.
4
Whenever a row display has been terminated, the corresponding RiCF ï¬ag will be set along with
update of CDRC3-CDRC0 ï¬eld.
Refer to section 9 for detailed description of On-Screen Display.
4.2.8 Multi-Function Timer Interrupts
There are two different interrupting sources, TOF and RTIF bits of Multi-Function Timer Register,
in this module. The interrupt service routine address is speciï¬ed by the contents of memory
location $FFF0 and $FFF1.
Multi-Function Timer
Address bit 7
$1C TOF
bit 6 bit 5 bit 4 bit 3 bit 2 bit 1
RTIF TOFIE RTIE IRQN WDOG RT1
bit 0
State
on reset
RT0 0000 0011
TOF - Timer Overï¬ow
1 (set) â 8-bit ripple timer overï¬ow has occurred.
0 (clear) â No 8-bit ripple timer overï¬ow has occurred.
This bit is set when the 8-bit ripple counter overï¬ows from $FF to $00; a timer overï¬ow interrupt
will occur, if TOFIE (bit 5) is set. TOF is cleared by writing a â0â to the bit.
RTIF - Real Time Interrupt Flag
1 (set) â A real time interrupt has occurred.
0 (clear) â A real time interrupt has not occurred.
A RTIF indicates when the output of the RTI circuit goes active. The clock frequency that drives
the RTI circuit is E/16384 giving a maximum interrupt period of 3.9ms at a bus rate of 4.2MHz. A
CPU interrupt request will be generated if RTIE is set. RTIE is cleared by writing a â0â to the bit.
MC68HC05T16
RESETS AND INTERRUPTS
TPG
MOTOROLA
4-11
|
▷ |