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Section 9 Timers
Rev. 6.00 Sep 12, 2006 page 207 of 526
REJ09B0326-0600
Bit 4
Reserved Bit:
Bit 4 is reserved; it is always read as 1, and cannot be modified.
Bits 3 to 0
Internal Clock Select (TMA3 to TMA0):
Bits 3 to 0 select the clock input to TCA.
The selection is made as follows.
Description
Bit 3:
TMA3
Bit 2:
TMA2
Bit 1:
TMA1
Bit 0:
TMA0
Prescaler and Divider Ratio
or Overflow Period
Function
0 0 0 0 PSS,
φ
/8192 (initial
value)
Interval timer
1
PSS,
φ
/4096
1 0 PSS,
φ
/2048
1
PSS,
φ
/512
1 0 0 PSS,
φ
/256
1
PSS,
φ
/128
1 0 PSS,
φ
/32
1
PSS,
φ
/8
1 0 0 0 PSW,
1
s
Clock
time
base
1 PSW,
0.5
s
1 0 PSW,
0.25
s
1 PSW,
0.03125
s
1
0
0
PSW and TCA are reset
1
1 0
1
Timer Counter A (TCA)
Bit
7 6 5 4 3 2 1 0
TCA7 TCA6 TCA5 TCA4 TCA3 TCA2 TCA1 TCA0
Initial
value 0 0 0 0 0 0 0 0
Read/Write R R R R R R R R
TCA is an 8-bit read-only up-counter, which is incremented by internal clock input. The clock
source for input to this counter is selected by bits TMA3 to TMA0 in timer mode register A
(TMA). TCA values can be read by the CPU in active mode, but cannot be read in subactive
mode. When TCA overflows, the IRRTA bit in interrupt request register 1 (IRR1) is set to 1.
Содержание F-ZTAT H8/3642A Series
Страница 6: ...Rev 6 00 Sep 12 2006 page iv of xx ...
Страница 8: ...Rev 6 00 Sep 12 2006 page vi of xx ...
Страница 21: ...Rev 6 00 Sep 12 2006 page xix of xx Appendix E Product Code Lineup 522 Appendix F Package Dimensions 524 ...
Страница 22: ...Rev 6 00 Sep 12 2006 page xx of xx ...
Страница 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Страница 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Страница 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Страница 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Страница 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Страница 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...