HCS08 datasheet(63/198 Pages) NXP

63 / 198 page

Chapter 5 Resets, Interrupts, and General System Control

MC9S08QD4 Series MCU Data Sheet, Rev. 6

Freescale Semiconductor

5.8.7

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

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

321

ID7

ID6

ID5

ID4

ID3

ID2

ID1

ID0

Reset:

000

001

= Unimplemented or Reserved

Figure 5-8. System Device Identification Register — Low (SDIDL)

Table 5-9. SDIDL Register Field Descriptions

Field

Description

7:0

ID[7:0]

Part Identification Number — Each derivative in the HCS08 family has a unique identification number. The

MC9S08QD4 series is hard coded to the value 0x011. See also ID bits in Table 5-8.

321

RRTIF

RTICLKS

RTIE

RTIS

RTIACK

Reset:

000

= Unimplemented or Reserved

Figure 5-9. System RTI Status and Control Register (SRTISC)

Table 5-10. 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 32 kHz ICS clock.

RTIE

Real-Time Interrupt Enable — This read-write bit enables real-time interrupts.

0 Real-time interrupts disabled.

1 Real-time interrupts enabled.

2:0

RTIS

Real-Time Interrupt Delay Selects — These read/write bits select the period for the RTI. See Table 5-11

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