MC9S08DZ16 FREESCALE [Freescale Semiconductor, Inc], MC9S08DZ16 Datasheet - Page 81

• Manufacturer Part Number: MC9S08DZ16
• Description: 8-Bit HCS08 Central Processor Unit (CPU)
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

1
5.8.5
This high page register contains bits to configure MCU specific features on the MC9S08DZ60 Series
devices.
Freescale Semiconductor
This bit can be written only one time after reset. Additional writes are ignored.
COPCLKS
Reset:
ADHTS
MCSEL
COPW
Field
2:0
7
6
4
W
R
COPCLKS
System Options Register 2 (SOPT2)
COP Watchdog Clock Select — This write-once bit selects the clock source of the COP watchdog. See
Table 5-6
0 Internal 1-kHz clock is source to COP.
1 Bus clock is source to COP.
COP Window — This write-once bit selects the COP operation mode. When set, the 0x55-0xAA write sequence
to the SRS register must occur in the last 25% of the selected period. Any write to the SRS register during the
first 75% of the selected period will reset the MCU.
0 Normal COP operation.
1 Window COP operation.
ADC Hardware Trigger Select — This bit selects which hardware trigger initiates conversion for the analog to
digital converter when the ADC hardware trigger is enabled (ADCTRG is set in ADCSC2 register).
0 Real Time Counter (RTC) overflow.
1 External Interrupt Request (IRQ) pin.
MCLK Divide Select— These bits enable the MCLK output on PTA0 pin and select the divide ratio for the MCLK
output according to the formula below when the MCSEL bits are not equal to all zeroes. In case that the MCSEL
bits are all zeroes, the MCLK output is disabled.
0
7
1
= Unimplemented or Reserved
for details.
COPW
0
6
1
Figure 5-6. System Options Register 2 (SOPT2)
Table 5-7. SOPT2 Register Field Descriptions
MCLK frequency = Bus Clock frequency ÷ (2 * MCSEL)
MC9S08DZ60 Series Data Sheet, Rev. 4
0
0
5
ADHTS
0
4
Description
Chapter 5 Resets, Interrupts, and General System Control
3
0
0
0
2
MCSEL
0
1
0
0
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