mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 764

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Reset
Memory map and register definition
35.3.2 Low Power Timer Prescale Register (LPTMRx_PSR)
Addresses: LPTMR0_PSR is FFFF_84C0h base + 4h offset = FFFF_84C4h
764
Bit
W
R
PRESCALE
Reserved
31
0
31–7
Field
6–3
30
0
LPTMR1_PSR is FFFF_84D0h base + 4h offset = FFFF_84D4h
29
0
28
0
This read-only bitfield is reserved and always has the value zero.
Prescale Value
The Prescaler Value register field configures the size of the Prescaler (in Time Counter mode) or width of
the Glitch Filter (in Pulse Counter mode). The Prescale Value should only be altered when the LPTMR is
disabled.
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
27
0
26
0
Prescaler divides the prescaler clock by 2; Glitch Filter does not support this configuration.
Prescaler divides the prescaler clock by 4; Glitch Filter recognizes change on input pin after 2
rising clock edges.
Prescaler divides the prescaler clock by 8; Glitch Filter recognizes change on input pin after 4
rising clock edges.
Prescaler divides the prescaler clock by 16; Glitch Filter recognizes change on input pin after 8
rising clock edges.
Prescaler divides the prescaler clock by 32; Glitch Filter recognizes change on input pin after 16
rising clock edges.
Prescaler divides the prescaler clock by 64; Glitch Filter recognizes change on input pin after 32
rising clock edges.
Prescaler divides the prescaler clock by 128; Glitch Filter recognizes change on input pin after 64
rising clock edges.
Prescaler divides the prescaler clock by 256; Glitch Filter recognizes change on input pin after 128
rising clock edges.
Prescaler divides the prescaler clock by 512; Glitch Filter recognizes change on input pin after 256
rising clock edges.
Prescaler divides the prescaler clock by 1024; Glitch Filter recognizes change on input pin after
512 rising clock edges.
Prescaler divides the prescaler clock by 2048; Glitch Filter recognizes change on input pin after
1024 rising clock edges.
Prescaler divides the prescaler clock by 4096; Glitch Filter recognizes change on input pin after
2048 rising clock edges.
Prescaler divides the prescaler clock by 8192; Glitch Filter recognizes change on input pin after
4096 rising clock edges.
Prescaler divides the prescaler clock by 16384; Glitch Filter recognizes change on input pin after
8192 rising clock edges.
25
0
24
0
MCF51JF128 Reference Manual, Rev. 2, 03/2011
23
0
22
0
LPTMRx_PSR field descriptions
21
0
Table continues on the next page...
20
0
19
0
0
18
0
Preliminary
17
0
16
0
15
0
Description
14
0
13
0
12
0
11
0
10
0
0
9
0
8
Freescale Semiconductor, Inc.
0
7
0
6
PRESCALE
0
5
4
0
0
3
0
2
0
1
PCS
0
0