mc68hc916y3 Freescale Semiconductor, Inc, mc68hc916y3 Datasheet - Page 426

• Manufacturer Part Number: mc68hc916y3
• Description: Mc68hc16y3 16 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

ILQSPI[2:0] — Interrupt Level for QSPI
ILSCI[2:0] — Interrupt Level for SCI
INTV[7:0] — Interrupt Vector Number
D.7.4 SCI Control Register
SCCR0 — SCI Control Register 0
Bits [15:13] — Not Implemented
SCBR[12:0] — SCI Baud Rate
D-48
MOTOROLA
RESET:
15
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).
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
simultaneously request interrupt service, the QSPI takes priority over the SCI.
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.
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
value of SCCR0 bits during a transfer operation disrupts operation.
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. Baud clock rate is calculated as
follows:
NOT USED
14
13
12
0
Freescale Semiconductor, Inc.
11
For More Information On This Product,
0
SCI Baud Rate
10
0
Go to: www.freescale.com
9
0
8
0
=
or
7
0
------------------------------------------- -
32 SCBR[12:0]
SCBR[12:0]
6
0
f
sys
5
0
4
0
3
0
MC68HC16Y3/916Y3
USER’S MANUAL
2
1
$YFFC08
1
0
0
0