SPMCK16Z4MPV20 datasheet(270/500 Pages) FREESCALE

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GENERAL-PURPOSE TIMER

M68HC16 Z SERIES

11-6

USER’S MANUAL

The CPU16 recognizes only interrupt request signals of a priority greater than the con-

dition code register interrupt priority (IP) mask value. When the CPU acknowledges an

interrupt request, the priority of the acknowledged request is written to the IP mask and

driven out on the IMB address lines.

When the IP mask value driven out on the address lines is the same as the IRL value,

the GPT contends for arbitration priority. GPT arbitration priority is determined by the

value of IARB[3:0] in GPTMCR. Each MCU module that can make interrupt requests

must be assigned a non-zero IARB value to implement an arbitration scheme. Arbitra-

tion is performed by serial assertion of IARB[3:0] bit values.

When the GPT wins interrupt arbitration, it responds to the CPU interrupt acknowledge

cycle by placing an interrupt vector number on the data bus. The vector number is

used to calculate displacement into the CPU16 exception vector table. Vector num-

bers are formed by concatenating the value in ICR IVBA[3:0] with a 4-bit value sup-

plied by the GPT when an interrupt request is made. Hardware prevents the vector

number from changing while it is being driven out on the IMB. Vector number assign-

ment is shown in Table 11-2.

At reset, IVBA[3:0] is initialized to $0. To enable interrupt-driven timer operation, the

upper nibble of a user-defined vector number ($40 – $FF) must be written to IVBA, and

interrupt handler routines must be located at the addresses pointed to by the corre-

sponding vector.

NOTE

IVBA[3:0] must be written before GPT interrupts are enabled, or the

GPT could supply a vector number ($00 to $0F) that corresponds to

an assigned or reserved exception vector.

The internal GPT interrupt priority hierarchy is shown in Table 11-2. The lower the in-

terrupt source number, the higher the priority. A single GPT interrupt source can be

given priority over all other GPT interrupt sources by assigning the priority adjust field

(IPA[3:0]) in the ICR a value equal to its source number.

Table 11-2 GPT Interrupt Sources

Name

Source

Number

Source

Vector

Number

—

0000

Adjusted channel

IVBA : 0000

IC1

0001

Input capture 1

IVBA : 0001

IC2

0010

Input capture 2

IVBA : 0010

IC3

0011

Input capture 3

IVBA : 0011

OC1

0100

Output compare 1

IVBA : 0100

OC2

0101

Output compare 2

IVBA : 0101

OC3

0110

Output compare 3

IVBA : 0110

OC4

0111

Output compare 4

IVBA : 0111

IC4/OC5

1000

Input capture 4/output compare 5

IVBA : 1000

1001

Timer overflow

IVBA : 1001

PAOV

1010

Pulse accumulator overflow

IVBA : 1010

PAI

1011

Pulse accumulator input

IVBA : 1011

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