
Section 9 Timers
Rev. 6.00 Sep 12, 2006 page 208 of 526
REJ09B0326-0600
TCA is cleared by setting bits TMA3 and TMA2 of TMA to 11.
Upon reset, TCA is initialized to H'00.
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.
Clock Output:
Setting bit TMOW in port mode register 1 (PMR1) to 1 causes a clock signal to be
output at pin TMOW. Eight different clock output signals can be selected by means of bits TMA7
to TMA5 in TMA. The system clock divided by 32, 16, 8, or 4 can be output in active mode and
sleep mode. A 32.768 kHz signal divided by 32, 16, 8, or 4 can be output in active mode, sleep
mode, and subactive mode.
Summary of Contents for F-ZTAT H8/3642A Series
Page 6: ...Rev 6 00 Sep 12 2006 page iv of xx ...
Page 8: ...Rev 6 00 Sep 12 2006 page vi of xx ...
Page 22: ...Rev 6 00 Sep 12 2006 page xx of xx ...
Page 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Page 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Page 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Page 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Page 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Page 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...