HD6473258P10 Renesas Electronics America, HD6473258P10 Datasheet - Page 73

• Manufacturer Part Number: HD6473258P10
• Description: IC H8 MCU OTP 32K 64DIP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/325r

Specifications of HD6473258P10

• Core Processor: H8/300
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: SCI, UART/USART
• Number Of I /o: 53
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: OTP
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 64-DIP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Peripherals: -

4.2.3 Disabling of Interrupts after Reset
All interrupts, including NMI, are disabled immediately after a reset. The first program instruction,
located at the address specified at the top of the vector table, is therefore always executed. To
prevent program crashes, this instruction should initialize the stack pointer (example: MOV.W
#xx:16, SP). After execution of this instruction, the NMI interrupt is enabled. Other interrupts
remain disabled until their enable bits are set to 1.
4.3 Interrupts
4.3.1 Overview
There are four input pins for external interrupts (NMI, IRQ
interrupts originating on-chip. The features of these interrupts are:
• All internal and external interrupts except NMI can be masked by the I bit in the CCR.
• IRQ
• Interrupts are individually vectored. The software interrupt-handling routine does not have to
Table 4-2 lists all the interrupts in their order of priority and gives their vector numbers and the
addresses of their entries in the vector table.
sensing can be selected for each interrupt individually. NMI is edge-sensed, and either the rising
or falling edge can be selected.
determine what type of interrupt has occurred.
0
to IRQ
2
can be rising-edge-sensed, falling-edge-sensed, or level-sensed. The type of
64
0
to IRQ
2
). There are also 17 internal