UPD78F0034BGC-8BS-A Renesas Electronics America, UPD78F0034BGC-8BS-A Datasheet - Page 417

• Manufacturer Part Number: UPD78F0034BGC-8BS-A
• Description: MCU 8-Bit 78K0 CISC 32KB Flash 2.5V/3.3V/5V 64-Pin LQFP
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0034BGC-8BS-A

• Package: 64LQFP
• Family Name: 78K0
• Maximum Speed: 12 MHz
• Ram Size: 1 KB
• Program Memory Size: 32 KB
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 51
• Interface Type: 3-Wire/UART
• On-chip Adc: 8-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 3

19.4.3 Software interrupt request acknowledgment operation
status word (PSW), then program counter (PC), the IE flag is reset (0), and the contents of the vector table (003EH,
003FH) are loaded into PC and branched.
CPU processing
CPU processing
Remark 1 clock: 1/f
Remark 1 clock: 1/f
A software interrupt request is acknowledged by BRK instruction execution. Software interrupts cannot be disabled.
If a software interrupt request is acknowledged, the contents are saved into the stacks in the order of the program
Return from a software interrupt is possible with the RETB instruction.
Caution
(
(
PR = 1)
PR = 0)
(
(
PR = 1)
PR = 0)
IF
IF
Do not use the RETI instruction for returning from the software interrupt.
IF
IF
Figure 19-12. Interrupt Request Acknowledge Timing (Maximum Time)
Figure 19-11. Interrupt Request Acknowledge Timing (Minimum Time)
CPU
CPU
(f
Instruction
(f
CPU
CPU
Instruction
: CPU clock)
: CPU clock)
CHAPTER 19 INTERRUPT FUNCTIONS
User’s Manual U14046EJ5V0UD
Divide instruction
25 clocks
Instruction
33 clocks
32 clocks
8 clocks
PSW and PC save,
jump to interrupt
servicing
PSW and PC save,
jump to interrupt
servicing
7 clocks
6 clocks
6 clocks
Interrupt servicing
program
Interrupt servicing
program
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