UPD78F9212CS-CAB-A Renesas Electronics America, UPD78F9212CS-CAB-A Datasheet - Page 184

• Manufacturer Part Number: UPD78F9212CS-CAB-A
• Description: MCU 8BIT 4KB FLASH 16PIN
• Manufacturer: Renesas Electronics America
• Series: 78K0S/Kx1+r

Specifications of UPD78F9212CS-CAB-A

• Core Processor: 78K0S
• Core Size: 8-Bit
• Speed: 10MHz
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 13
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 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: -
• Connectivity: -

10.4 Interrupt Servicing Operation
10.4.1 Maskable interrupt request acknowledgment operation
corresponding interrupt mask flag is cleared to 0. If the interrupt enabled status is in effect (when the IE flag is set to
1), then the request is acknowledged as a vector interrupt.
shown in Table 10-3.
from the interrupt request assigned the highest priority.
182
Symbol
(4)
A maskable interrupt request can be acknowledged when the interrupt request flag is set to 1 and the
The time required to start the vectored interrupt servicing after a maskable interrupt request has been generated is
See Figures 10-7 and 10-8 for the interrupt request acknowledgment timing.
When two or more maskable interrupt requests are generated at the same time, they are acknowledged starting
PSW
Program status word (PSW)
The program status word is used to hold the instruction execution result and the current status of the interrupt
requests. The IE flag, used to enable and disable maskable interrupts, is mapped to PSW.
PSW can be read- and write-accessed in 8-bit units, as well as using bit manipulation instructions and
dedicated instructions (EI and DI). When a vectored interrupt is acknowledged, the PSW is automatically
saved to a stack, and the IE flag is reset to 0.
Reset signal generation sets PSW to 02H.
Cautions 1. Be sure to clear bits 0, 1, 6, and 7 to 0.
IE
IE
7
0
1
Table 10-3. Time from Generation of Maskable Interrupt Request to Servicing
Disabled
Enabled
Z
6
2. Before setting the INTM0 register, be sure to set the corresponding interrupt mask flag
(
request flag (
enable interrupts.
5
0
MK = 1) to disable interrupts. After setting the INTM0 register, clear the interrupt
Figure 10-5. Program Status Word (PSW) Configuration
Note The wait time is maximum when an interrupt
Remark
9 clocks
AC
4
request is generated immediately before BT and
BF instructions.
Minimum Time
3
0
CHAPTER 10 INTERRUPT FUNCTIONS
1 clock:
IF
Whether to enable/disable interrupt acknowledgment
2
0
= 0), then clear the interrupt mask flag (
User’s Manual U16994EJ6V0UD
f
CPU
1
1
1
(f
CPU
CY
0
: CPU clock)
19 clocks
Maximum Time
After reset
Used in the execution of ordinary instructions
02H
Note
MK
= 0), which will