MC9S08GT16CFB Freescale Semiconductor, MC9S08GT16CFB Datasheet - Page 123

• Manufacturer Part Number: MC9S08GT16CFB
• Manufacturer: Freescale Semiconductor

Specifications of MC9S08GT16CFB

• Cpu Family: HCS08
• Device Core Size: 8b
• Frequency (max): 20MHz
• Interface Type: SCI/SPI
• Program Memory Type: Flash
• Program Memory Size: 16KB
• Total Internal Ram Size: 1KB
• # I/os (max): 36
• Number Of Timers - General Purpose: 4
• Operating Supply Voltage (typ): 2.5/3.3V
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 2.08V
• On-chip Adc: 8-chx10-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Package Type: PQFP
• Lead Free Status / Rohs Status: Not Compliant

The filter registers show the filter value (FLT).
FLT — Filter Value
7.5.6
TRIM — ICG Trim Setting
Freescale Semiconductor
The FLT bits indicate the current filter value, which controls the DCO frequency. The FLT bits are
read only except when the CLKS bits are programmed to self-clocked mode (CLKS = 00). In
self-clocked mode, any write to ICGFLTU updates the current 12-bit filter value. Writes to the
ICGFLTU register will not affect FLT if a previous latch sequence is not complete.
The TRIM bits control the internal reference generator frequency. They allow a ± 25% adjustment of
the nominal (POR) period. The bit’s effect on period is binary weighted (i.e., bit 1 will adjust twice as
much as changing bit 0). Increasing the binary value in TRIM will increase the period and decreasing
the value will decrease the period.
ICG Trim Register (ICGTRM)
Reset:
Reset:
Read:
Write:
Read:
Write:
POR:
U = Unaffected by MCU reset
Figure 7-18. ICG Lower Filter Register (ICGFLTL)
Bit 7
U
1
7
1
Figure 7-19. ICG Trim Register (ICGTRM)
MC9S08GB/GT Data Sheet, Rev. 2.3
U
6
1
6
0
U
5
0
5
0
U
4
0
4
0
TRIM
FLT
U
3
0
3
0
U
2
0
2
0
ICG Registers and Control Bits
U
1
0
1
0
Bit 0
U
0
0
0
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