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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
18-29
3–4
TCRCF
TCRCLK signal filter control. Controls the TCRCLK digital filter determining whether the TCRCLK
signal input (after a synchronizer) is filtered with the same filter clock as the channel input signals
or uses the system clock divided by 2, and also whether the TCRCLK digital filter works in
integrator mode or two sample mode. The following table describes TCRCLK filter clock/mode.
For more information, refer to the eTPU User’s Manual.
5
—
Reserved.
6
AM
Angle mode selection. When the AM bit is set (MPC5554: and neither TCR1 nor TCR2 are STAC
interface clients), the EAC (eTPU Angle Clock) hardware provides angle information to the
channels using the TCR2 bus. When the AM bit is cleared (non-angle mode), EAC operation is
disabled, and its internal registers can be used as general purpose registers.
0 EAC operation is disabled.
1 TCR2 works in angle mode; (MPC5554: if TCR2 is not a STAC client, the EAC works and
stores tooth counter and angle tick counter data in TCR2.)
(MPC5554: If TCR1 or TCR2 is a STAC bus client, EAC operation is forbidden. Therefore, if AM
is set, the angle logic will not work properly.)
Note: AM must not be changed when ETPU_MCR[GTBE] = 1.
Note: Changing AM may cause expurious transition detections on channel 0, depending on the
channel mode and state.
For more information, refer to the eTPU User’s Manual.
7–9
—
Reserved.
10–15
TCR2P
Timer count register 2 prescaler control. Part of the TCR2 clocking system. TCR2 is clocked from
the output of a prescaler. The prescaler divides its input by (TCR2P+1) allowing frequency
divisions from 1 to 64. The prescaler input is the system clock divided by 8 (in gated or non-gated
clock mode) or Internal Timebase input, or TCRCLK filtered input. This field has no effect on
TCCR2 in Angle Mode. For more information on TCR2, refer to the eTPU User’s Manual.
Table 18-12. ETPU_TBCR Field Descriptions (Continued)
Bits
Name
Description
TCRCF
Filter Input
Filter Mode
00
system clock divided by 2
two sample
01
filter clock of the channels
two sample
10
system clock divided by 2
integration
11
filter clock of the channels
integration
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