ST72C334N2B6 STMicroelectronics, ST72C334N2B6 Datasheet - Page 37

• Manufacturer Part Number: ST72C334N2B6
• Description: Microcontrollers (MCU) Flash 8K SPI/SCI
• Manufacturer: STMicroelectronics

Specifications of ST72C334N2B6

• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 8 KB
• Data Ram Size: 384 B
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 44
• Number Of Timers: 16 bit
• Operating Supply Voltage: 3.2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Package / Case: SDIP-56
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / Rohs Status: No

INTERRUPTS (Cont’d)
Figure 26. Interrupt Processing Flowchart
Table 6. Interrupt Mapping
N
10
11
12
13
0
1
2
3
4
5
6
7
8
9
FROM RESET
Data-EEPROM Data EEPROM Interrupt
TIMER A
TIMER B
Source
RESET
Block
TRAP
MCC
CSS
SCI
EI0
EI1
EI2
EI3
SPI
Reset
Software Interrupt
Not used
Main Clock Controller Time Base Interrupt
or Clock Security System Interrupt
External Interrupt Port A3..0
External Interrupt Port F2..0
External Interrupt Port B3..0
External Interrupt Port B7..4
Not used
SPI Peripheral Interrupts
TIMER A Peripheral Interrupts
TIMER B Peripheral Interrupts
SCI Peripheral Interrupts
Not used
EXECU TE INSTRUCTION
Description
RESTORE PC, X, A, CC FROM STACK
THIS CLEARS I BIT BY DEFAULT
FETCH NEXT INSTR UCTION
N
BIT I SET
IRET
Y
Y
ST72334J/N, ST72314J/N, ST72124J
Register
MCCSR
EECSR
SCISR
SPISR
CRSR
TASR
TBSR
Label
N/A
N/A
N
LOAD PC FROM INTERRUPT VECTO R
Priority
Highest
Priority
Lowest
Priority
Order
N
STACK PC, X, A, CC
SET I BIT
BIT I SET
HALT
from
Exit
yes
yes
no
no
Y
FFECh-FFEDh
FFFCh-FFFDh
FFFAh-FFFBh
FFEEh-FFE Fh
FFEAh-FFEBh
FFFEh-FFFFh
FFE8h-FFE9h
FFE6h-FFE7h
FFE4h-FFE5h
FFE2h-FFE3h
FFE0h-FFE1h
FFF8h-FFF9h
FFF6h-FFF7h
FFF4h-FFF5h
FFF2h-FFF3h
FFF0h-FFF1h
Address
Vector
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