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18.3.3 External Event Counter Operation ........................................................................ 417
18.3.4 Input Capture Timer Operation ............................................................................. 417
18.4
Interrupts ............................................................................................................................ 418
18.5
Usage Notes........................................................................................................................ 418
Section 19 Timer C............................................................................................................... 419
19.1
Overview ............................................................................................................................ 419
19.1.1 Features ................................................................................................................. 419
19.1.2 Block Diagram ...................................................................................................... 420
19.1.3 Timer C Pins.......................................................................................................... 421
19.1.4 Register Configuration .......................................................................................... 421
19.2
Register Descriptions.......................................................................................................... 422
19.2.1 Timer Mode Register C (TMC: $00D) ................................................................. 422
19.2.2 Port Mode Register A (PMRA: $004) .................................................................. 426
19.2.3 Timer Counter C (TCC) ........................................................................................ 427
19.2.4 Timer Write Register TWCL/U (TWCL: $00E, TWCU: $00F)........................... 428
19.2.5 Timer Read Register TRCL/U (TRCL: $00E, TRCU: $00F) ............................... 429
19.2.6 Watchdog On Flag (WDON: $020, 1) .................................................................. 430
19.3
Timer C Operation.............................................................................................................. 431
19.3.1 Free-Running Timer Operation ............................................................................. 431
19.3.2 Reload Timer Operation........................................................................................ 431
19.3.3 PWM Output Operation ........................................................................................ 432
19.3.4 Watchdog Timer Operation .................................................................................. 432
19.4
Interrupts ............................................................................................................................ 433
19.5
Usage Notes........................................................................................................................ 433
Section 20 Serial Interface ................................................................................................. 435
20.1
Overview ............................................................................................................................ 435
20.1.1 Features ................................................................................................................. 435
20.1.2 Block Diagram ...................................................................................................... 436
20.1.3 Serial Interface Pins .............................................................................................. 437
20.1.4 Register Configuration .......................................................................................... 437
20.2
Register Descriptions.......................................................................................................... 438
20.2.1 Serial Mode Register (SMR: $005) ...................................................................... 438
20.2.2 Serial Data Register SRL/U (SRL: $006, SRU: $007) ......................................... 440
20.2.3 Octal Counter (OC) ............................................................................................... 441
20.2.4 Port Mode Register A (PMRA: $004) .................................................................. 442
20.2.5 Port Mode Register C (PMRC: $025) ................................................................... 443
20.2.6 Miscellaneous Register (MIS: $00C).................................................................... 445
20.3
Operation ............................................................................................................................ 447
20.3.1 Operating Modes ................................................................................................... 447
20.3.2 Serial Data Format ................................................................................................ 447
20.3.3 Transfer Clock....................................................................................................... 448