mc68hc05x4dw Freescale Semiconductor, Inc, mc68hc05x4dw Datasheet - Page 123

• Manufacturer Part Number: mc68hc05x4dw
• Description: Xc68hc705x4 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

15-ptimer
Compare register
timer clocks
Output compare
Output compare
processor clock
timer clocks
flag and TCMP
Note: (1) The CPU write to the compare registers may take place at any time, but a compare
Note: (2) The output compare flag is set at the timer state T11 that follows the comparison
processor clock
Timer overflow
Note: The timer overflow flag is set at timer state T11 (transition of counter from $FFFF to
Internal
Internal
Internal
counter
register
only occurs at timer state T01. Thus a four cycle difference may exist between the write to
the compare register and the actual compare.
match ($F457 in this example).
Internal
Figure 14. Timer state timing diagram for output compare
counter
$0000). It is cleared by a read of the timer status register during the internal
processor clock high time, followed by a read of the counter low register.
16-bit
Figure 15. Timer state timing diagram for timer overflow
latch
16-bit
flag
T00
T01
T10
T11
T00
T01
T10
T11
Freescale Semiconductor, Inc.
CPU writes $F457
For More Information On This Product,
$F456
$FFFF
(Note 1)
16-Bit Programmable Timer
Go to: www.freescale.com
(Note 1)
(Note 2)
$F457
$0000
$F458
$F457
$0001
$F459
16-Bit Programmable Timer
$0002
MC68HC05X4 Rev 1.0
Timer state diagrams