
vii
15.4
Interrupts ............................................................................................................................ 375
15.5
Usage Notes........................................................................................................................ 376
15.6
Notes on Mounting Built-in A/D Converter Microcomputers
(HD404318 and HD404339 Series Only) .......................................................................... 378
Section 16 Prescalers ........................................................................................................... 383
16.1
Overview ............................................................................................................................ 383
16.2
Prescaler S (PSS)................................................................................................................ 387
16.3
Prescaler W (PSW) (HD404339 and HD404369 Series Only).......................................... 387
Section 17 Timer A (HD404318/HD404358/HD404358R
/HD404339 /HD404369 Series).................................................................. 389
17.1
Overview ............................................................................................................................ 389
17.1.1 Features ................................................................................................................. 389
17.1.2 Block Diagram ...................................................................................................... 390
17.1.3 Register Configuration .......................................................................................... 392
17.2
Register Descriptions.......................................................................................................... 393
17.2.1 Timer Mode Register A (TMA: $008).................................................................. 393
17.2.2 Timer Counter A (TCA)........................................................................................ 398
17.3
Timer A Operation ............................................................................................................. 399
17.3.1 Free-Running Timer Operation ............................................................................. 399
17.3.2 Clock Time Base Operation .................................................................................. 400
17.4
Interrupts ............................................................................................................................ 400
17.5
Usage Notes........................................................................................................................ 400
Section 18 Timer B............................................................................................................... 401
18.1
Overview ............................................................................................................................ 401
18.1.1 Features ................................................................................................................. 401
18.1.2 Block Diagram ...................................................................................................... 402
18.1.3 Timer B Pins.......................................................................................................... 404
18.1.4 Register Configuration .......................................................................................... 404
18.2
Register Descriptions.......................................................................................................... 405
18.2.1 Timer Mode Register B1 (TMB1: $009) .............................................................. 405
18.2.2 Timer Mode Register B2 (TMB2: $026) .............................................................. 409
18.2.3 Timer Counter B (TCB) ........................................................................................ 410
18.2.4 Timer Write Register TWBL/U (TWBL: $00A, TWBU: $00B).......................... 411
18.2.5 Timer Read Register TRBL/U (TRBL: $00A, TRBU: $00B).............................. 412
18.2.6 Port Mode Register B (PMRB: $024) ................................................................... 413
18.2.7 Input Capture Status Flag (ICSF: $021, 0)............................................................ 415
18.2.8 Input Capture Error Flag (ICEF: $021, 1)............................................................. 415
18.3
Timer B Operation.............................................................................................................. 416
18.3.1 Free-Running Timer.............................................................................................. 416
18.3.2 Reload Timer Operation........................................................................................ 417