P912XDP512F0MPVR datasheet(344/1348 Pages) FREESCALE

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Chapter 7 Enhanced Capture Timer (S12ECT16B8CV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

344

Freescale Semiconductor

7.3.2.26

Precision Timer Modulus Counter Prescaler Select Register (PTMCPSR)

Read: Anytime

Write: Anytime

All bits reset to zero.

00000111

00001111

00011111

00111111

01111111

128

11111111

256

76543210

PTMPS7

PTMPS6

PTMPS5

PTMPS4

PTMPS3

PTMPS2

PTMPS1

PTMPS0

Reset

00000000

Figure 7-48. Precision Timer Modulus Counter Prescaler Select Register (PTMCPSR)

Table 7-33. PTMCPSR Field Descriptions

Field

Description

7:0

PTMPS[7:0]

Precision Timer Modulus Counter Prescaler Select Bits — These eight bits specify the division rate of the

modulus counter prescaler. These are effective only when the PRNT bit of TSCR1 is set to 1. Table 7-34 shows

some possible division rates.

The newly selected prescaler division rate will not be effective until a load of the load register into the modulus

counter count register occurs.

Table 7-34. Precision Timer Modulus Counter Prescaler Select Examples when PRNT = 1

PTMPS7

PTMPS6

PTMPS5

PTMPS4

PTMPS3

PTMPS2

PTMPS1

PTMPS0

Prescaler

Division

Rate

000000001

000000012

000000103

000000114

000001005

000001016

000001107

Table 7-32. Precision Timer Prescaler Selection Examples when PRNT = 1

PTPS7

PTPS6

PTPS5

PTPS4

PTPS3

PTPS2

PTPS1

PTPS0

Prescale

Factor

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