System Integration Unit

Table 4-37.

RTTR Bit Definitions

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Physical Address

 

 

 

 

 

 

RTTR

 

 

 

 

 

 

 

System Integration Unit

 

 

 

 

 

 

 

0x4090_000C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset

LCK

0

reserved

DEL

CK_DIV

? ? ? ? ? 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Bits

Name

Description

 

 

 

 

 

Locking bit for the trim value.

<31>

LCK

0 – RTTR value is allowed to be altered.

 

 

1 – RTTR value is not allowed to be altered.

 

 

 

<30:26>

reserved

 

 

 

<25:16>

DEL

Trim delete count.

This value represents the number of 32 kHz clocks to delete when clock trimming begins.

 

 

 

 

 

<15:0>

CK_DIV

Clock divider count.

This value is the number of 32 kHz clock cycles, plus 1, per HZ clock cycle.

 

 

 

 

 

4.3.2.2RTC Alarm Register (RTAR)

The RTAR, Table 4-38, is a 32-bit register. The processor can both read and write to this register. Following each rising edge of the HZ clock, this register is compared to the RCNR. If the two are equal and RTSR[ALE] is set, then RTSR[AL] is set.

Because of the asynchronous nature of the HZ clock relative to the processor clock, writes to this register are controlled by a hardware mechanism that delays the actual write to the register by two 32 kHz clock cycles after the processor store is performed.

The RTAR is initialized to 0x0 at reset.

Table 4-38. RTAR Bit Definitions

 

 

 

Physical Address

 

 

 

 

 

 

RTAR

 

 

 

 

 

 

 

System Integration Unit

 

 

 

 

 

 

 

0x4090_0004

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RTMV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bits

 

 

Name

 

 

 

 

 

 

 

 

 

 

 

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

<31:0>

 

 

RTMV

 

RTC Target Match Value.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The value compared against the RTC counter.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4-30

Intel® PXA255 Processor Developer’s Manual

Page 134
Image 134
Intel PXA255 manual RTC Alarm Register Rtar, Rttr Bit Definitions, Rtar Bit Definitions