s908ey8ad4cfjer Freescale Semiconductor, Inc, s908ey8ad4cfjer Datasheet - Page 100

• Manufacturer Part Number: s908ey8ad4cfjer
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Internal Clock Generator (ICG) Module
8.7.6 ICG DCO Stage Register
DSTG7:DSTG0 — ICG DCO Stage Control Bits
100
These bits indicate the number of stages (above the minimum) in the digitally controlled oscillator. The
total number of stages is approximately equal to $1FF, so changing DSTG from $00 to $FF will
approximately double the period. Incrementing DSTG will increase the period (decrease the
frequency) by 0.202 percent to 0.368 percent (decrementing has the opposite effect). DSTG cannot
be written when ICGON is set to prevent inadvertent frequency shifting. When ICGON is set, DSTG is
controlled by the digital loop filter. Since the DCO is active during reset, reset has no effect on DSTG
and the value may vary.
Address: $003A
Reset:
Read:
Write:
DSTG7
Figure 8-16. ICG DCO Stage Control Register (ICGDSR)
Bit 7
R
R
MC68HC908EY16 • MC68HC908EY8 Data Sheet, Rev. 10
= Reserved
DSTG6
R
6
DSTG5
R
5
DSTG4
Unaffected by reset
R
4
DSTG3
R
3
DSTG2
R
2
DSTG1
R
1
Freescale Semiconductor
DSTG0
Bit 0
R