US38024-BAG1 Renesas Electronics America, US38024-BAG1 Datasheet - Page 275
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US38024-BAG1
Manufacturer Part Number
US38024-BAG1
Description
DEV EVALUATION KIT H8/38024
Manufacturer
Renesas Electronics America
Series
H8®r
Type
MCUr
Datasheet
1.US38024-BAG1.pdf
(684 pages)
Specifications of US38024-BAG1
Contents
2G (Second-generation) Evaluation Board, HEW debugger support, Cable and CD-ROM
For Use With/related Products
H8/38024
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
- Current page: 275 of 684
- Download datasheet (5Mb)
Section 9 Timers
9.2.3
Timer Operation
Interval Timer Operation
When bit TMA3 in timer mode register A (TMA) is cleared to 0, timer A functions as an 8-bit
interval timer.
Upon reset, TCA is cleared to H'00 and bit TMA3 is cleared to 0, so up-counting and interval
timing resume immediately. The clock input to timer A is selected by bits TMA2 to TMA0 in
TMA; any of eight internal clock signals output by prescaler S can be selected.
After the count value in TCA reaches H'FF, the next clock signal input causes timer A to
overflow, setting bit IRRTA to 1 in interrupt request register 1 (IRR1). If IENTA = 1 in interrupt
enable register 1 (IENR1), a CPU interrupt is requested. *
At overflow, TCA returns to H'00 and starts counting up again. In this mode timer A functions as
an interval timer that generates an overflow output at intervals of 256 input clock pulses.
Note: * For details on interrupts, see section 3.3, Interrupts.
Real-Time Clock Time Base Operation
When bit TMA3 in TMA is set to 1, timer A functions as a real-time clock time base by counting
clock signals output by prescaler W. The overflow period of timer A is set by bits TMA1 and
TMA0 in TMA. A choice of four periods is available. In time base operation (TMA3 = 1), setting
bit TMA2 to 1 clears both TCA and prescaler W to their initial values of H'00.
Rev. 8.00 Mar. 09, 2010 Page 253 of 658
REJ09B0042-0800
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