UPSD3254 STMICROELECTRONICS [STMicroelectronics], UPSD3254 Datasheet - Page 41

• Manufacturer Part Number: UPSD3254
• Description: Flash Programmable System Devices with 8032 Microcontroller Core
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

USART Interrupt
Figure 16. Interrupt System
The USART Interrupt is generated by RI
(receive interrupt) OR TI (transmit interrupt).
When the USART Interrupt is generated, the
corresponding request flag must be cleared by
software. The interrupt service routine will have
to check the various USART registers to
Interrupt
Sources
USART
Timer
Timer
USART
Timer
INT0
INT1
DDC
USB
I2C
2nd
0
1
2
UPSD3254A, UPSD3254BV, UPSD3253B, UPSD3253BV
IE /
Global
Enable
determine the source and clear the
corresponding flag.
Both USART’s are identical, except for the
additional interrupt controls in the Bit 4 of the
additional interrupt control registers (A7H, B7H)
IP / IPA Priority
High
Low
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