Time Processor Unit 3
MPC561/MPC563 Reference Manual, Rev. 1.2
19-20
Freescale Semiconductor
8
SOFT RST Soft reset. The TPU3 performs an internal reset when both the SOFT RST bit in the TPUMCR2
and the STOP bit in TPUMCR are set. The CPU must write zero to the SOFT RST bit to bring
the TPU3 out of reset. The SOFT RST bit must be asserted for at least nine clocks.
0 Normal operation
1 Puts TPU3 in reset until bit is cleared
NOTE: Do not attempt to access any other TPU3 registers when this bit is asserted. When this
bit is asserted, it is the only accessible bit in the register.
9:10
ETBANK Entry table bank select. This field determines the bank where the microcoded entry table is
situated. After reset, this field is 0b00. This control bit field is write once after reset. ETBANK is
used when the microcode contains entry tables not located in the default bank 0. To execute the
ROM functions on this MCU, ETBANK[1:0] must be 00. Refer to
.
NOTE: This field should not be modified by the programmer unless necessary because of custom
microcode.
11:13
FPSCK
Filter prescaler clock. The filter prescaler clock control bit field determines the ratio between
system clock frequency and minimum detectable pulses. The reset value of these bits is zero,
defining the filter clock as four system clocks. Refer to
14
T2CF
T2CLK pin filter control. When asserted, the T2CLK input pin is filtered with the same filter clock
that is supplied to the channels. This control bit is write once after reset.
0 Uses fixed four-clock filter
1 T2CLK input pin filtered with same filter clock that is supplied to the channels
15
DTPU
Disable TPU3 pins. When the disable TPU3 control pin is asserted, pin TP15 is configured as an
input disable pin. When the TP15 pin value is zero, all TPU3 output pins are three-stated,
regardless of the pins function. The input is not synchronized. This control bit is write once after
reset.
0 TP15 functions as normal TPU3 channel
1 TP15 pin configured as output disable pin. When TP15 pin is low, all TPU3 output pins are in
a high-impedance state, regardless of the pin function.
Table 19-19. Entry Table Bank Location
ETBANK Bank
00
0
01
1
10
2
11
3
Table 19-20. System Clock Frequency/Minimum Guaranteed Detected Pulse
Filter Control
Divide By
20 MHz
33 MHz
40 MHz
56 MHz
000
4
200 ns
121 ns
100 ns
71 ns
001
8
400 ns
242 ns
200 ns
143 ns
010
16
800 ns
485 ns
400 ns
286 ns
011
32
1.6
µ
s
970 ns
800 ns
571 ns
100
64
3.2
µ
s
1.94
µ
s
1.60
µ
s
1.14
µ
s
Table 19-18. TPUMCR2 Bit Descriptions (continued)
Bits
Name
Description
Summary of Contents for MPC561
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Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...