HCS08 datasheet(73/290 Pages) MOTOROLA

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Data Sheet — MC9S08GB60/D V1.5

MOTOROLA

MC9S08GB/GT

LVD — Low Voltage Detect

If the LVD reset is enabled (LVDE = LVDRE = 1) and the supply drops below the LVD trip voltage,

an LVD reset occurs. The LVD function is disabled when the MCU enters stop. To maintain LVD

operation in stop, the LVDSE bit must be set.

1 = Reset caused by LVD trip or POR.

0 = Reset not caused by LVD trip or POR.

5.8.3 System Background Debug Force Reset Register (SBDFR)

This register contains a single write-only control bit. A serial background command such as

WRITE_BYTE must be used to write to SBDFR. Attempts to write this register from a user program are

ignored. Reads always return $00.

Figure 5-4 System Background Debug Force Reset Register (SBDFR)

BDFR — Background Debug Force Reset

A serial background command such as WRITE_BYTE may be used to allow an external debug host

to force a target system reset. Writing logic 1 to this bit forces an MCU reset. This bit cannot be written

from a user program.

5.8.4 System Options Register (SOPT)

This register may be read at any time. Bits 3 and 2 are unimplemented and always read 0. This is a

write-once register so only the first write after reset is honored. Any subsequent attempt to write to SOPT

(intentionally or unintentionally) is ignored to avoid accidental changes to these sensitive settings. SOPT

should be written during the user’s reset initialization program to set the desired controls even if the

desired settings are the same as the reset settings.

Bit 7

654321

Bit 0

Read:

00000000

Write:

BDFR(1)

NOTES:

1. BDFR is writable only through serial background debug commands, not from user programs.

Reset:

00000000

= Unimplemented or Reserved

Bit 7

654321

Bit 0

Read:

COPE

COPT

STOPE

BKGDPE

Write:

Reset:

11010011

= Unimplemented or Reserved

Figure 5-5 System Options Register (SOPT)

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