SPMCK16Z4MPV20 datasheet(414/500 Pages) FREESCALE

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M68HC16 Z SERIES

D-40

USER’S MANUAL

ILQSPI[2:0] — Interrupt Level for QSPI

When an interrupt request is made, the ILQSPI value determines the priority level of

all QSPI interrupts. When a request is acknowledged, the QSM compares this value

to a mask value supplied by the CPU16 to determine whether to respond. ILQSPI must

have a value in the range $0 (interrupts disabled) to $7 (highest priority).

ILSCI[2:0] — Interrupt Level for SCI

When an interrupt request is made, the ILSCI value determines the priority level of all

SCI interrupts. When a request is acknowledged, the QSM compares this value to a

mask value supplied by the CPU16 to determine whether to respond. The field must

have a value in the range $0 (interrupts disabled) to $7 (highest priority).

If ILQSPI[2:0] and ILSCI[2:0] have the same non-zero value, and both submodules si-

multaneously request interrupt service, the QSPI takes priority over the SCI.

INTV[7:0] — Interrupt Vector Number

The value of INTV[7:1] is used for both QSPI and SCI interrupt requests; the value of

INTV0 used during an interrupt acknowledge cycle is supplied by the QSM. INTV0 is

at logic level zero during an SCI interrupt and at logic level one during a QSPI interrupt.

A write to INTV0 has no effect. Reads of INTV0 return a value of one. At reset, QIVR

is initialized to $0F, the uninitialized interrupt vector number. To use interrupt-driven

serial communication, a user-defined vector number must be written to QIVR.

D.6.4 SCI Control Register

SCCR0 contains the SCI baud rate selection field. Baud rate must be set before the

SCI is enabled. The CPU16 can read and write SCCR0 at any time. Changing the val-

ue of SCCR0 bits during a transfer operation disrupts operation.

Bits [15:13] — Not Implemented

SCBR[12:0] — SCI Baud Rate

SCI baud rate is programmed by writing a 13-bit value to this field. Writing a value of

zero to SCBR disables the baud rate generator. The baud clock rate is calculated as

follows:

where SCBR[12:0] is in the range of 1 to 8191.

SCCR0 — SCI Control Register 0

$YFFC08

NOT USED

SCBR[12:0]

RESET:

SCI Baud Rate

sys

SCBR[12:0]

--------------------------------------------

SCBR[12:0]

sys

SCI Baud Rate Desired

---------------------------------------------------------------------------

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