Renesas Hitachi H8S/2191, Hardware Manual, Page: 20 / 1065

Rev. 2.0, 11/00, page xi of xviii
18.2.1 Watchdog Timer Counter (WTCNT)................................................................ 394
18.2.2 Watchdog Timer Control/Status Register (WTCSR)......................................... 394
18.2.3 System Control Register (SYSCR)................................................................... 397
18.2.4 Notes on Register Access................................................................................. 397
18.3 Operation..................................................................................................................... 399
18.3.1 Watchdog Timer Operation.............................................................................. 399
18.3.2 Interval Timer Operation ................................................................................. 400
18.3.3 Timing of Setting of Overflow Flag (OVF) ...................................................... 401
18.4 Interrupts ..................................................................................................................... 402
18.5 Usage Notes................................................................................................................. 402
18.5.1 Contention between Watchdog Timer Counter (WTCNT) Write
and Increment.................................................................................................. 402
18.5.2 Changing Value of CKS2 to CKS0 .................................................................. 403
18.5.3 Switching between Watchdog Timer Mode and Interval Timer Mode ............... 403
Section 19 8-Bit PWM ................................................................................... 405
19.1 Overview ..................................................................................................................... 405
19.1.1 Features........................................................................................................... 405
19.1.2 Block Diagram ................................................................................................ 405
19.1.3 Pin Configuration ............................................................................................ 406
19.1.4 Register Configuration..................................................................................... 406
19.2 Register Descriptions ................................................................................................... 407
19.2.1 Bit PWM Data Registers 0, 1, 2 and 3 (PWR0, PWR1, PWR2, PWR3) ............ 407
19.2.2 8-bit PWM Control Register (PW8CR) ............................................................ 408
19.2.3 Port Mode Register 3 (PMR3).......................................................................... 409
19.2.4 Module Stop Control Register (MSTPCR) ....................................................... 410
19.3 8-Bit PWM Operation .................................................................................................. 411
Section 20 12-Bit PWM ................................................................................. 413
20.1 Overview ..................................................................................................................... 413
20.1.1 Features........................................................................................................... 413
20.1.2 Block Diagram ................................................................................................ 414
20.1.3 Pin Configuration ............................................................................................ 415
20.1.4 Register Configuration..................................................................................... 415
20.2 Register Descriptions ................................................................................................... 416
20.2.1 12-Bit PWM Control Registers (CPWCR, DPWCR) ........................................ 416
20.2.2 12-Bit PWM Data Registers (CPWDR, DPWDR) ............................................ 419
20.2.3 Module Stop Control Register (MSTPCR) ....................................................... 420
20.3 Operation..................................................................................................................... 421
20.3.1 Output Waveform............................................................................................ 421
Section 21 14-Bit PWM ................................................................................. 423
21.1 Overview ..................................................................................................................... 423