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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.
Watchdog control section
Timebase
counter
Base
clock
(φ)
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)
11
Period =2
/F
, 2
F
25
2
/F
, 2
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.
26-bit counter
12
13
22
/F
, 2
/F
, 2
/F
, 2
F
F
F
26
/F
F
Watchdog timer
Timebase timer
Selector
Timebase timer interrupt
23
24
/F
, 2
/F
,
F
F
Chapter 19 Timebase Timer
1.Overview
263
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