SC312XDP512F0MPVR datasheet(548/1348 Pages) FREESCALE

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Chapter 13 Periodic Interrupt Timer (S12PIT24B4CV1)

MC9S12XDP512 Data Sheet, Rev. 2.21

548

Freescale Semiconductor

13.3.0.6

PIT Time-Out Flag Register (PITTF)

Read: Anytime

Write: Anytime (write to clear); writes to the reserved bits have no effect

13.3.0.7

PIT Micro Timer Load Register 0 to 1 (PITMTLD0–1)

Read: Anytime

Write: Anytime

76543210

0000

PTF3

PTF2

PTF1

PTF0

Reset

00000000

= Unimplemented or Reserved

Figure 13-8. PIT Time-Out Flag Register (PITTF)

Table 13-6. PITTF Field Descriptions

Field

Description

3:0

PTF[3:0]

PIT Time-out Flag Bits for Timer Channel 3:0 — PTF is set when the corresponding 16-bit timer modulus

down-counter and the selected 8-bit micro timer modulus down-counter have counted to zero. The ﬂag can be

cleared by writing a one to the ﬂag bit. Writing a zero has no effect. If ﬂag clearing by writing a one and ﬂag setting

happen in the same bus clock cycle, the ﬂag remains set. The ﬂag bits are cleared if the PIT module is disabled

or if the corresponding timer channel is disabled.

0 Time-out of the corresponding PIT channel has not yet occurred.

1 Time-out of the corresponding PIT channel has occurred.

76543210

PMTLD7

PMTLD6

PMTLD5

PMTLD4

PMTLD3

PMTLD2

PMTLD1

PMTLD0

Reset

00000000

Figure 13-9. PIT Micro Timer Load Register 0 (PITMTLD0)

76543210

PMTLD7

PMTLD6

PMTLD5

PMTLD4

PMTLD3

PMTLD2

PMTLD1

PMTLD0

Reset

00000000

Figure 13-10. PIT Micro Timer Load Register 1 (PITMTLD1)

Table 13-7. PITMTLD0–1 Field Descriptions

Field

Description

7:0

PMTLD[7:0]

PIT Micro Timer Load Bits 7:0 — These bits set the 8-bit modulus down-counter load value of the micro timers.

Writing a new value into the PITMTLD register will not restart the timer. When the micro timer has counted down

to zero, the PMTLD register value will be loaded. The PFLMT bits in the PITCFLMT register can be used to

immediately update the count register with the new value if an immediate load is desired.

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