FUJITSU MB91460 SERIES FR60 - Manual (Page 279)

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Chapter 19 Timebase Timer
1.Overview
Chapter 19 Timebase Timer
1. Overview
The timebase timer is a selector that uses the output from a 26-bit timebase counter using the base clock (F).
The timebase timer is an interval-interrupt generating timer that is used to acquire main PLL lock wait time and
to count a long time.
2. Features
■
Timebase timer (TBT)
• Type : Detects timebase timer bit output and generates an interval interrupt.
• Quantity : 1
• Interval time: 8 types (Timebase timer bit output)
Period =2
11
/F
F
, 2
12
/F
F
, 2
13
/F
F
, 2
22
/F
F
, 2
23
/F
F
, 2
24
/F
F
,
2
25
/F
F
, 2
26
/F
F
• Operation start/stop: Always in operation (Can be replaced by interrupt request enable control)
• Timebase counter clear: Continuously writes “A5”“5A” in the timebase counter clear register CTBR using the
software.
Selector
Watchdog control section
Base
clock
(
φ)
26-bit counter
Timebase timer interrupt
Watchdog timer
Timebase timer
Timebase
counter