Page Comparison

13:0

RW

RTC Prescaler

rtc prescaler is a 14-bit pre-scaling value used to generate the clock for the RTC counter.

STC clock is divided by this pre-scaler to generate trigger of the RTC counter.

The relationship of CLKrtc and CLKstc is:

CLKrtc = CLKstc / (rtc prescaler + 1)

When rct prescaler value changes, rtc pre scaling will respond to the change immediately.

7:0

RW

External Divider STC

External clock dividor for STC. External clock (or crystal input) is divided by this factor and the divided result may be used as STC reference clock.

When stc config changes, the dividor will not respond until dividor counter reaches 0.

The relationship between the external clock and the STC trigger clock is:

External divided clock = External clock / (2 * (ext div+1))

To setup STC at 90kHz for external 27MHz reference, please set

stc config = 0x0000, (27MHz div by 2*1 = 13.5MHz)

stc prescaler = 0x95,(13.5MHz div by 150 = 90kHz)

1510:0

RW

Timer1 Count

Timer1

 11-bit counter value. When timer1 is activated, this counter will count down to zero when triggered by specified clock source.
When tm1 count reaches 0 and trigger asserts, timer1 interrupt will be asserted.

15:0

RW

Timer2 16-bit counter value

Timer2 16-bit counter value. When timer2 is activated, it will count down to zero when triggered by specified clock source.
If timer2 cnt is zero and trigger asserts, interrupt will be generated.

SRC

5:2

RW

Timer3 trigger source selection
0x0: System clock(default)
0x1: STC trigger clock(STC pre-scaling counter wrap- around)
0x2: RTC trigger clock(RTC pre-scaling counter wrap- around)
0x3: External clock (see stc config for reference)
0x4: CLK timer2 trig (from timer2 trigger signal)
0x5: CLK timer2 wrap (from timer2 wrap-around signal)
others: System clock

RPT

1

RW

timer3 one-shot/continuous operation
0: One-shot operation(default). In this mode, timer will stop and clear GO(bit-0)automatically when the register tm3 count reaches 0.
1: Continuous operation. In this mode, register tm3 reload will be reloaded into tm3 count when register tm3 count reaches 0.

GO

0

RW

GO: timer3 run/stop operation
0: Timer3 paused(default).pre scaler counter and tm3 counter will keep value in this state.
1: Timer3 running 

15:0

RW

Timer3 16-bit counter value

Timer3 16-bit counter value. When timer3 is activated, it will count down to zero when triggered by specified clock source.
If timer3 cnt reaches zero and trigger asserts, interrupt will be generated.

stc latched

Bit 32 of latched STC value. STC counter value is latched when RISC writes this register
no matter what the written value is (written value is meaningless).

15:0

RW

Timer0 Reload Value

When tm0 count reaches 0, timer0 will generate interrupt and the value of the register tm0 reload will be reloaded into tm0 count with repeat mode.
When tm0 reload value changes, timer0 counter operation will not respond at once until timer0 generates wraparound.
If user wants timer0 to generate interrupt after 10ms, the register tm0 reload should be set 0x0383(10ms/(1/90k) -1 = 10*90 -1) at CLKstc 90K.

15:0

RW

Timer1 Reload Value

When tm1 count reaches 0, the value of tm1 reload will be reloaded into tm1 count with repeat mode.
When tm1 reload value changes, timer1 counter operation will not respond at once until timer1 generates wraparound.
If user wants timer1 to generate interrupt after 10ms, the register tm0 reload should be set 0x0383(10ms/(1/90k) -1 = 10*90-1) at CLKstc 90K.