MC68HC705T16 MOTOROLA [Motorola, Inc], MC68HC705T16 Datasheet - Page 41

• Manufacturer Part Number: MC68HC705T16
• Description: High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit
• Manufacturer: MOTOROLA [Motorola, Inc]

VFLB - VFLBK status
RiCF - Row i display status
Whenever a row display has been terminated, the corresponding RiCF flag will be set along with
update of CDRC3-CDRC0 field.
Refer to section 9 for detailed description of On-Screen Display.
4.2.8
There are two different interrupting sources, TOF and RTIF bits of Multi-Function Timer Register,
in this module. The interrupt service routine address is specified by the contents of memory
location $FFF0 and $FFF1.
TOF - Timer Overflow
This bit is set when the 8-bit ripple counter overflows from $FF to $00; a timer overflow interrupt
will occur, if TOFIE (bit 5) is set. TOF is cleared by writing a ‘0’ to the bit.
RTIF - Real Time Interrupt Flag
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 ‘0’ to the bit.
MC68HC05T16
Multi-Function Timer
1 (set)
0 (clear) –
1 (set)
0 (clear) –
1 (set)
0 (clear) –
1 (set)
0 (clear) –
Multi-Function Timer Interrupts
–
–
–
–
Vertical flyback (leading edge) signal detected.
No Vertical flyback signal detected.
Row i display has been terminated.
Row i display has been not terminated.
8-bit ripple timer overflow has occurred.
No 8-bit ripple timer overflow has occurred.
A real time interrupt has occurred.
A real time interrupt has not occurred.
Address bit 7
$1C
RESETS AND INTERRUPTS
TOF
RTIF
bit 6
TOFIE
bit 5
RTIE
bit 4
IRQN WDOG
bit 3
bit 2
bit 1
RT1
bit 0
RT0
MOTOROLA
0000 0011
on reset
State
TPG
4-11
4