Time Processor Unit 3
MPC561/MPC563 Reference Manual, Rev. 1.2
19-6
Freescale Semiconductor
— If the enhanced prescaler is selected (EPSCKE = 1), the EPSCK bits select a value by which
the system clock is divided. The lowest frequency for TCR1 clock is system clock divided by
64x8. The highest frequency for TCR1 clock is system clock divided by two (2x1). See
and
.
— The output of either the standard prescaler or the enhanced prescaler is then divided by 1, 2, 4,
or 8, depending on the value of the TCR1P field in the TPUMCR.
— If the TPUMCR2[DIV2] bit is one, the TCR1 counter increments at a rate of the internal clock
divided by two. If DIV2 is zero, the TCR1 increment rate is defined by the output of the TCR1
prescaler (which, in turn, takes as input the output of either the standard or enhanced prescaler).
shows a diagram of the TCR1 prescaler control block.
Table 19-2. Enhanced TCR1 Prescaler Divide Values
EPSCK Value
Divide System Clock By
0x00
2
0x01
4
0x02
6
0x03
8
0x04, 0x05,...0x1d
10,12,...60
0x1e
62
0x1f
64
Table 19-3. TCR1 Prescaler Values
TCR1P Value
Divide by
0b00
1
0b01
2
0b10
4
0b11
8
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
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...