v
9.2
Register Descriptions......................................................................................................... 192
9.2.1
Timer Counter (TCNT)......................................................................................... 192
9.2.2
Time Constant Registers A and B (TCORA and TCORB).................................. 192
9.2.3
Timer Control Register (TCR).............................................................................. 193
9.2.4
Timer Control/Status Register (TCSR) ................................................................ 196
9.2.5
Serial/Timer Control Register (STCR)................................................................. 198
Operation............................................................................................................................ 199
9.3.1
TCNT Increment Timing...................................................................................... 199
9.3.2
Compare-Match Timing........................................................................................ 201
9.3.3
External Reset of TCNT....................................................................................... 203
9.3.4
Setting of TCSR Overflow Flag (OVF)................................................................ 203
Interrupts............................................................................................................................ 204
Sample Application............................................................................................................ 204
Application Notes.............................................................................................................. 205
9.6.1
Contention between TCNT Write and Clear........................................................ 205
9.6.2
Contention between TCNT Write and Increment................................................. 206
9.6.3
Contention between TCOR Write and Compare-Match ...................................... 207
9.6.4
Contention between Compare-Match A and Compare-Match B.......................... 208
9.6.5
Increment Caused by Changing of Internal Clock Source.................................... 208
9.3
9.4
9.5
9.6
Section 10 PWM Timers
.................................................................................................... 211
10.1 Overview............................................................................................................................ 211
10.1.1 Features................................................................................................................. 211
10.1.2 Block Diagram...................................................................................................... 212
10.1.3 Input and Output Pins........................................................................................... 212
10.1.4 Register Configuration.......................................................................................... 213
10.2 Register Descriptions......................................................................................................... 213
10.2.1 Timer Counter (TCNT)......................................................................................... 213
10.2.2 Duty Register (DTR) ............................................................................................ 214
10.2.3 Timer Control Register (TCR).............................................................................. 215
10.3 Operation............................................................................................................................ 217
10.3.1 Timer Increment.................................................................................................... 217
10.3.2 PWM Operation.................................................................................................... 218
10.4 Application Notes.............................................................................................................. 219
Section 11 Watchdog Timer
.............................................................................................. 221
11.1 Overview............................................................................................................................ 221
11.1.1 Features................................................................................................................. 221
11.1.2 Block Diagram...................................................................................................... 222
11.1.3 Output Pin............................................................................................................. 222
11.1.4 Register Configuration.......................................................................................... 223
11.2 Register Descriptions......................................................................................................... 223
11.2.1 Timer Counter (TCNT)......................................................................................... 223