HD64F3048VTF8 Renesas Electronics America, HD64F3048VTF8 Datasheet - Page 146

• Manufacturer Part Number: HD64F3048VTF8
• Description: IC H8 MCU FLASH 128K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of HD64F3048VTF8

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 8MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F3048VX8

Section 5 Interrupt Controller
In this situation, conduct one of the following countermeasures.
Countermeasure 1: When clears IRQaF flag, do not use the bit manipulation instruction, read the
ISR in bytes. Then write a value in bytes which sets IRQnF flag to 0 and other bits to 1.
For example, if a = 0
Countermeasure 2: During IRQb interrupt exception processing, carry out IRQbF flag clear
dummy processing.
For example, if b = 1
5.5.5
NMI is an exception processing that can be executed by the interrupt controller and CPU when the
chip internal circuits are operating normally under a specified electrical characteristics. If an NMI
is executed when the circuits are not operating normally due to some factors such as software or
abnormal interrupt of input to the pins (runaway execution), the operation will not be guaranteed.
Incorrect NMI Operation Factors: Software
1. When an interrupt exception processing is executed in an H8/300H CPU, it is assumed that the
2. Requests for NMIs can be accepted on the rising or falling edge of a pin. Acceptance of the
3. This chip has a break function to implement on-board emulation for specific customers. To use
Rev. 7.00 Sep 21, 2005 page 120 of 878
REJ09B0259-0700
MOV.B @ISR,R0L
MOV.B #HFE,R0L
MOV.B R0L,@ISR
IRQB
stack pointer (SP(ER7)) has already been set by software, and that the stack pointer (SP(ER7))
points to the stack area set in a system such as RAM. If the program is in a runaway execution,
the stack pointer may be overflowed and updated illegally. Therefore, normal operation will
not be guaranteed.
rising or falling edge depends on the setting of the bit NMIEG in the system control register
(SYSCR). It is necessary for the customer to set the bit according to the designated system.
When the program is in a runaway execution, this bit may be rewritten illegally. Therefore, the
system may not operate as expected.
this break function, execute the BRK instruction (H’5770). Note that the BRK instruction is
Notes on Non-Maskable Interrupts (NMI)
MOV.B #HFD,R0L
MOV.B R0L,@ISR
·
·
·