S9S08AW16A FREESCALE [Freescale Semiconductor, Inc], S9S08AW16A Datasheet - Page 76

• Manufacturer Part Number: S9S08AW16A
• Description: HCS08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Chapter 5 Resets, Interrupts, and System Configuration
5.9.7
This register contains one read-only status flag, one write-only acknowledge bit, three read/write delay
selects, and three unimplemented bits, which always read 0.
76
RTICLKS
RTIS[2:0]
Reset
Reset
RTIACK
ID[7:0]
Field
Field
RTIE
RTIF
7:0
2:0
7
6
5
4
W
W
R
R
System Real-Time Interrupt Status and Control Register (SRTISC)
RTIF
ID7
Part Identification Number — Each derivative in the HCS08 Family has a unique identification number. The
MC9S08AC16 Series is hard coded to the value 0x012. See also ID bits in
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.
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 logic 0.
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 external clock.
Real-Time Interrupt Enable — This read-write bit enables real-time interrupts.
0 Real-time interrupts disabled.
1 Real-time interrupts enabled.
Real-Time Interrupt Delay Selects — These read/write bits select the wakeup delay for the RTI. The clock
source for the real-time interrupt is a self-clocked source which oscillates at about 1 kHz, is independent of other
MCU clock sources. Using external clock source the delays will be crystal frequency divided by value in
RTIS2:RTIS1:RTIS0. See
0
0
7
7
= Unimplemented or Reserved
Figure 5-8. System Device Identification Register — Low (SDIDL)
= Unimplemented or Reserved
Figure 5-9. System RTI Status and Control Register (SRTISC)
RTIACK
ID6
0
0
0
6
6
Table 5-10. SRTISC Register Field Descriptions
Table 5-9. SDIDL Register Field Descriptions
Table
RTICLKS
MC9S08AC16 Series Data Sheet, Rev. 8
ID5
0
0
5
5
5-11.
RTIE
ID4
1
0
4
4
Description
Description
ID3
3
0
3
0
0
RTIS2
ID2
0
0
2
Table
2
5-8.
Freescale Semiconductor
RTIS1
ID1
1
0
1
1
RTIS0
ID0
0
0
0
0