HD6473228F10V Renesas Electronics America, HD6473228F10V Datasheet - Page 84

• Manufacturer Part Number: HD6473228F10V
• Description: MCU 5V 32K,PB-FREE 64-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/325r

Specifications of HD6473228F10V

• Core Processor: H8/300
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: SCI, UART/USART
• Number Of I /o: 53
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: OTP
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 64-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Peripherals: -

4.3.6 Interrupt Response Time
Table 4-4 indicates the time that elapses from an interrupt request signal until the first instruction of
the software interrupt-handling routine is executed. Since the H8/325 Series accesses its on-chip
memory 16 bits at a time, very fast interrupt service can be obtained by placing interrupt-handling
routines in on-chip ROM and the stack in on-chip RAM.
Table 4-4. Number of States before Interrupt Service
No.
1
2
3
4
5
6
Notes:
4.4 Note on Stack Handling
In word access, the least significant bit of the address is always assumed to be 0. The stack is
always accessed by word access. Care should be taken to keep an even value in the stack pointer
(general register R7). Use the PUSH and POP (or MOV.W Rn, @–SP and MOV.W @SP+, Rn)
instructions to push and pop registers on the stack.
Setting the stack pointer to an odd value can cause programs to crash. Figure 4-7 shows an example
of damage caused when the stack pointer contains an odd address.
Reason for wait
Interrupt priority decision
Wait for completion of
current instruction
Save PC and CCR
Fetch vector
Fetch instruction
Internal processing
Total
1. These values do not apply if the current instruction is an EEPMOV, MOVFPE, or
2. If wait states are inserted in external memory access, these values may be longer.
3. 1 for internal interrupts.
MOVTPE instruction.
*1
On-chip memory
2
1 to 13
4
2
4
4
17 to 29
*3
75
Number of states
External memory
2
5 to 17
12
6
12
4
41 to 53
*3
*2
*2
*2
*2
*2