SC9RS08KA2 datasheet(41/134 Pages) FREESCALE

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Chapter 5 Resets, Interrupts, and General System Control

SC9RS08KA2 Series Data Sheet, Rev. 1

Freescale Semiconductor

5.8.4

System Real-Time Interrupt Status and Control Register (SRTISC)

This high page register contains status and control bits for the RTI.

Table 5-4. SDIDH Register Field Descriptions

Field

Description

7:4

REV[3:0]

Revision Number — The high-order 4 bits of address SDIDH are hard coded to reflect the current mask set

revision number (0–F).

3:0

ID[11:8]

Part Identification Number — Each derivative in the RS08 Family has a unique identification number. The

SC9RS08KA2 Series is hard coded to the value $0800. See also ID bits in Figure 5-4.

321

ID7

ID6

ID5

ID4

ID3

ID2

ID1

ID0

Reset:

000

= Unimplemented or Reserved

Figure 5-4. System Device Identification Register — Low (SDIDL)

Table 5-5. SDIDL Register Field Descriptions

Field

Description

7:0

ID[7:0]

Part Identification Number — Each derivative in the RS08 Family has a unique identification number. The

SC9RS08KA2 Series is hard coded to the value $0800. See also ID bits in Figure 5-3.

321

RRTIF

RTICLKS

RTIE

RTIS

RTIACK

Reset:

000

= Unimplemented or Reserved

Figure 5-5. System RTI Status and Control Register (SRTISC)

Table 5-6. SRTISC Register Field Descriptions

Field

Description

RTIF

Real-Time Interrupt Flag — This read-only status bit indicates the periodic wakeup timer has timed out.

0 Periodic wakeup timer not timed out.

1 Periodic wakeup timer timed out.

RTIACK

Real-Time Interrupt Acknowledge — This write-only bit is used to acknowledge real-time interrupt request

(write 1 to clear RTIF). Writing 0 has no meaning or effect. Reads always return 0.

RTICLKS

Real-Time Interrupt Clock Select — This read/write bit selects the clock source for the real-time interrupt.

0 Real-time interrupt request clock source is internal 1-kHz oscillator.

1 Real-time interrupt request clock source is internal trimmed 32-kHz oscillator (ICS module) and is divided by

32 in RTI logic to produce a trimmed 1-kHz clock source for RTI counter.

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