AN2502 Freescale Semiconductor / Motorola, AN2502 Datasheet - Page 23

• Manufacturer Part Number: AN2502
• Description: Using Two Channels of the HC08 TIM to Achieve a Full-Duplex Software SCI
• Manufacturer: Freescale Semiconductor / Motorola

MOTOROLA
Using Two Channels of the HC08 TIM to Achieve a Full-Duplex Software SCI
Freescale Semiconductor, Inc.
For More Information On This Product,
IN PROGRESS FLAG
PERIOD (1 BIT-TIME)
AS CLEAR ON OC
SHIFT REGISTER
CONFIGURE CH1
SET NEXT OC
PROGRESS?
CARRY SET?
SET CARRY
ROR Tx
TX_ISR
SET Tx
Tx IN
RTI
NO
NO
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Figure 31. Transmit ISR — Normal Mode
YES
YES
PERIOD (1 BIT-TIME)
CONFIGURE CH1
CLEAR CARRY
AS SET ON OC
SET NEXT OC
TX SHIFT
REG = 0?
NO
YES
PERIOD (1 BIT-TIME)
PROGRESS FLAG
AS CLEAR ON OC
CONFIGURE CH1
Tx SHIFT REG =
SET Tx EMPTY
SET NEXT OC
Tx DATA REG
CLEAR Tx IN
IS EMPTY?
Tx ER
FLAG
NO
YES
DISABLE CH1
AN2502/D
Software
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