mm912f634 Freescale Semiconductor, Inc, mm912f634 Datasheet - Page 248

• Manufacturer Part Number: mm912f634
• Description: Mm912f634 - Integrated S12 Based Relay Driver With Lin
• Manufacturer: Freescale Semiconductor, Inc

Functional Description and Application Information
4.32.3.2.7
Table 332. 9S12I32PIMV1 Test Register 1(CRGTEST1)
This register is reserved for factory test. This register is not writable.
Read: Anytime
4.32.4
4.32.4.1
An example of startup of clock system from Reset is given in
Freescale Semiconductor
0x003B
Reset
W
R
System
Reset
IR
Clock
IR
TRIM
load trim
from Flash
DCO
Clock
LOCKST
MULT
CPU
Write: Not Possible Functional Description
During startup from Reset DCO Clock is the Core Clock and, divided by 2, the Bus Clock.
IR Clock = Internal Reference Clock
Startup from Reset
U
U
7
9S12I32PIMV1 Test Register 1 (CRGTEST1)
reset state
$1FF
f
DCO_MIN
$00
U
U
6
Figure 73. Example for Startup of Clock System After Reset
flash trim value, e.g. $100
U
U
5
f
IREF_TRIM
vector fetch, program execution
f
= 32 kHz
DCO
U
U
4
Figure
t
STAB
increasing
73.
$4E2=1250, 32kHz*1250 = 40 MHz
S12S Clocks and Reset Generator (S12SCRGV1)
U
U
3
U
U
2
f
U
U
1
DCO
= 40 MHz
MM912F634
U
U
0
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