MC9S12G FREESCALE [Freescale Semiconductor, Inc], MC9S12G Datasheet - Page 599

• Manufacturer Part Number: MC9S12G
• Description: Ignores external trigger. Performs one conversion sequence and stops.
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

18.5.2.3
The SCI is inactive during stop mode for reduced power consumption. The STOP instruction does not
affect the SCI register states, but the SCI bus clock will be disabled. The SCI operation resumes from
where it left off after an external interrupt brings the CPU out of stop mode. Exiting stop mode by reset
aborts any transmission or reception in progress and resets the SCI.
The receive input active edge detect circuit is still active in stop mode. An active edge on the receive input
can be used to bring the CPU out of stop mode.
18.5.3
This section describes the interrupt originated by the SCI block.The MCU must service the interrupt
requests.
18.5.3.1
The SCI only originates interrupt requests. The following is a description of how the SCI makes a request
and how the MCU should acknowledge that request. The interrupt vector offset and interrupt number are
chip dependent. The SCI only has a single interrupt line (SCI Interrupt Signal, active high operation) and
all the following interrupts, when generated, are ORed together and issued through that port.
18.5.3.1.1
The TDRE interrupt is set high by the SCI when the transmit shift register receives a byte from the SCI
data register. A TDRE interrupt indicates that the transmit data register (SCIDRH/L) is empty and that a
Freescale Semiconductor
RXEDGIF SCIASR1[7]
Interrupt
BERRIF
BKDIF
TDRE
RDRF
IDLE
OR
TC
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.
If SCISWAI is set, any transmission or reception in progress stops at wait mode entry. The
transmission or reception resumes when either an internal or external interrupt brings the CPU out
of wait mode. Exiting wait mode by reset aborts any transmission or reception in progress and
resets the SCI.
Table 18-20
SCIASR1[1]
SCIASR1[0]
SCISR1[7]
SCISR1[6]
SCISR1[5]
SCISR1[3]
SCISR1[4]
Interrupt Operation
Source
Stop Mode
Description of Interrupt Operation
TDRE Description
lists the eight interrupt sources of the SCI.
Local Enable
RXEDGIE
BERRIE
BRKDIE
TCIE
ILIE
RIE
TIE
MC9S12G Family Reference Manual, Rev.1.01
Table 18-20. SCI Interrupt Sources
Active high level. Indicates that a byte was transferred from SCIDRH/L to the
transmit shift register.
Active high level. Indicates that a transmit is complete.
Active high level. The RDRF interrupt indicates that received data is available
in the SCI data register.
Active high level. This interrupt indicates that an overrun condition has occurred.
Active high level. Indicates that receiver input has become idle.
Active high level. Indicates that an active edge (falling for RXPOL = 0, rising for
RXPOL = 1) was detected.
Active high level. Indicates that a mismatch between transmitted and received data
in a single wire application has happened.
Active high level. Indicates that a break character has been received.
Description
Serial Communication Interface (S12SCIV5)
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