MM912H634CV1AE Freescale Semiconductor, MM912H634CV1AE Datasheet - Page 243

• Manufacturer Part Number: MM912H634CV1AE
• Description: 64KS12 LIN2xLS/HS Isense
• Manufacturer: Freescale Semiconductor
• Series: -r

Specifications of MM912H634CV1AE

• Applications: Automotive
• Core Processor: HCS12
• Program Memory Type: FLASH (64 kB)
• Controller Series: HCS12
• Ram Size: 6K x 8
• Interface: LIN
• Number Of I /o: -
• Voltage - Supply: 5.5 V ~ 27 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

4.38.3.2.2
The CPMUREFDIV register provides a finer granularity for the PLL multiplier steps when using the external oscillator as
reference.
Read: Anytime
Write: Anytime if PROT=0 (CPMUPROT register) and PLLSEL=1 (CPMUCLKS register). Else write has no effect.
The REFFRQ[1:0] bits are used to configure the internal PLL filter for optimal stability and lock time. For correct PLL operation
the REFFRQ[1:0] bits have to be selected according to the actual REFCLK frequency as shown in
If IRC1M is selected as REFCLK (OSCE=0) the PLL filter is fixed configured for the 1.0 MHz <= f
can still be written but will have no effect on the PLL filter configuration.
For OSCE=1, setting the REFFRQ[1:0] bits incorrectly can result in a non functional PLL (no locking and/or insufficient stability).
Freescale Semiconductor
0x0035
Reset
W
R
If OSCLCP is enabled (OSCE=1)
If OSCLCP is disabled (OSCE=0)
7
0
S12CPMU Reference Divider Register (CPMUREFDIV)
Write to this register clears the LOCK and UPOSC status bits.
REFFRQ[1:0]
Table 340. S12CPMU Reference Divider Register (CPMUREFDIV)
6
0
VCOCLK Frequency Ranges
Table 339. VCO Clock Frequency Selection
32 MHz <= f
48 MHz < f
MM912_634 Advance Information, Rev. 4.0
5
0
0
Reserved
Reserved
f REF
f REF
VCO
VCO
<= 6 4MHz
<= 48 MHz
=
=
------------------------------------ -

NOTE
f IRC 1 M
4
0
0
REFDIV
f OSC
+
1

3
1
VCOFRQ[1:0]
00
01
10
11
2
1
REFDIV[3:0]
REF
Table
<= 2.0 MHz range. The bits
1
1
341.
0
1
243