Realtek RTD2120K, Manual

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Realtek RTD2120-series
confidential 29
Register::PWM2_duty_width 0xFF34
Name Bits Read/Write Reset State Comments
PWM2_ DUT 7:0 R/W 0 PWM2 duty width
Register::PWM_source_select 0xFF35
Name Bits Read/Write Reset State Comments
reserved 7:6 -- 0 Reserved
PWM5_SEL 5:4 R/W 2 00: PWM5 is the same as PWM0
01: PWM5 is the same as PWM1
1x: PWM5 is the same as PWM2
PWM4_SEL 3:2 R/W 1 00: PWM4 is the same as PWM0
01: PWM4 is the same as PWM1
1x: PWM4 is the same as PWM2
PWM3_SEL 1:0 R/W 0 00: PWM3 is the same as PWM0
01: PWM3 is the same as PWM1
1x: PWM3 is the same as PWM2
Watchdog Timer
The Watchdog Timer automatically generates a device reset when it is overflowed. The interval of
overflow is about 0.25 sec to 2 sec(assume crystal is 12MHz) and can be programmed via register
CNT1.
CNT1
N
EN_WDT
BY_CNT3
WDT reset
OSC
0
0
1
1
CNT3
3*2
10
CNT2
2
10
BY_CNT2
Register::WATCHDOG_timer 0xFF36
Name Bits Read/Write Reset State Comments
WDT_EN 7 R/W 0 0: Disable watchdog timer
1: Enable watchdog timer
CLR_WDT 6 W 0 0: No effect
1: Clear all counters of watchdog
BY_CNT2 5 R/W 0 Signal bypass counter2*
0: signal pass through counter2
1: bypass
BY_CNT3 4 R/W 0 Signal bypass counter3*
0: signal pass through counter3