UPD78F9222CS-CAC-A Renesas Electronics America, UPD78F9222CS-CAC-A Datasheet - Page 231

• Manufacturer Part Number: UPD78F9222CS-CAC-A
• Description: MCU 8BIT 4KB FLASH 20PIN
• Manufacturer: Renesas Electronics America
• Series: 78K0S/Kx1+r

Specifications of UPD78F9222CS-CAC-A

• Core Processor: 78K0S
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 15
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

the interrupt is acknowledged after the instruction under execution is complete. Figure 12-8 shows an example of the
interrupt request acknowledgment timing for an 8-bit data transfer instruction MOV A, r. Since this instruction is
executed for 4 clocks, if an interrupt occurs for 3 clocks after the instruction fetch starts, the interrupt acknowledgment
processing is performed after the MOV A, r instruction is executed.
IE:
If an interrupt request flag (
IF:
MK:
Interrupt
Clock
CPU
Interrupt request flag
Interrupt mask flag
Flag to control maskable interrupt request acknowledgment (1 = enable, 0 = disable)
Figure 12-8. Interrupt Request Acknowledgment Timing (Example of MOV A, r)
Figure 12-7. Interrupt Request Acknowledgment Processing Algorithm
No
IF) is set before an instruction clock n (n = 4 to 10) under execution becomes n
MOV A, r
CHAPTER 12 INTERRUPT FUNCTIONS
Vectored interrupt
servicing
IE = 1?
MK = 0?
Start
IF = 1?
User’s Manual U16898EJ6V0UD
Yes (Interrupt request generated)
Yes
Yes
Saving PSW and PC, jump
No
No
to interrupt servicing
8 clocks
Interrupt request pending
Interrupt request pending
Interrupt servicing program
229
1,