CDC3205G-C Micronas, CDC3205G-C Datasheet - Page 124

• Manufacturer Part Number: CDC3205G-C
• Description: Automotive Controller Family The Device is a Microcontroller For Use in Automotive Applications.the On-chip Cpu is an Arm Processor ARM7TDMI with 32-bit Data And Address Bus, Which Supports Thumb format Instructions.
• Manufacturer: Micronas

CDC 32xxG-C
18.1.4. Operation
After reset the PFM is in standby mode (inactive) and the
output signal is LOW.
To prepare for active mode, write new values, if needed, for
the pulse width and the period length to the respective PFMx
register and select output inversion, if necessary, with flag
INV. For entering active mode set the enable bit SR1.PFMx.
Changing the PFMx register setting during active mode, is
simply done by writing a 32bit word to this register. After the
register has been updated, the PFM will produce an output
18.2. Registers
INV
r/w1:
r/w0:
The pulse width counter zero output HIGH time is calculated
by
and the duration of the period time by
Therefore, the pulse width counter zero output LOW time is
122
w
w
w
w
PFMx
INV
7
x
6
Invert Output Signal
inverted
direct
t
Period
t
t
LOW
HIGH
Pulse Width and Period Register
x
5
Period Length (High Byte)
Period Length (Low Byte)
=
=
=
t
Pulse Width
x
Period
4
Period Length
--------------------------------- -
Pulse Width
---------------------------- -
0x00
F
F
PF0C
–
PF0C
x
3
t
HIGH
x
2
x
1
June 12, 2003; 6251-579-1PD
x
0
3
2
1
0
Res
Offs
signal with the new pulse width and period length starting
with the next subsequent load signal of the period counter.
For data consistency, when using 8bit and 16bit writes, new
values will only become valid after a write to the pulse width
register (byte 2 in the PFMx register).
Returning the PFM to standby mode by clearing its Enable
Bit SR1.PFMx will immediately set its output to INV and dis-
able the clock input. The content of the PFMx register is not
affected by standby mode.
The state of the counters and the reload registers is not
readable.
Table 18–2 shows the relation of the Pulse Width and the
Period Length and its effect on the PFMx output.
Table 18–2:
Pulse Width
0
> 0
> 0
0
> 0
> 0
Pulse Width to Period Length Relation
Period Length
x
> Pulse Width
x
> Pulse Width
Pulse Width
Pulse Width
PRELIMINARY DATA SHEET
INV
0
1
PFMx output
Always low
Always high
High pulses
Always high
Always low
Low pulses
Micronas