MB90495G_09 Datasheet, PDF (40/96 Pages) Fujitsu Component Limited. – 16-bit Proprietary Microcontroller

MB90495G Series
• Block Diagram of 16-bit Free-run Timer
Pin
FRCK
Timer counter data register (TCDT)
16-bit free-run timer
OF CLK STOP
CLR
Output count value
to input capture
φ
Prescaler
2
Timer counter control
status register
(TCCS)
IVF
IVFE
STOP
Re-
served
CLR
CLK2 CLK1 CLK0
Free-run timer
interrupt request
φ : Machine clock
OF : overflow
Note: The 16-bit I/O timer contains one 16-bit free-run timer.
The interrupt request number of the 16-bit free-run timer is as follows :
Interrupt request number : 19 (13H)
Prescaler: Takes a fraction of the machine clock, and supplies a count clock to the 16-bit up-counter. One of
four machine clock fractions can be selected by setting the timer counter control status register
(TCCS) .
Timer Counter Register (TCDT) :
This is a 16-bit up-counter. It is possible to read the current counter value of the 16-bit free-run timer
by reading this counter. The counter can be set to an arbitrary value by writing to it while stopped.
Timer Counter Control Status Register (TCCS) :
TCCS selects the divide ratio of a machine clock, executes software clear of counter values. and
enables or disables counter operation. Also TCCS confirms and clears an overflow generation flag,
and enables or disables interruption.
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DS07-13713-6E