HD6477021X20V Renesas Electronics America, HD6477021X20V Datasheet - Page 108
HD6477021X20V
Manufacturer Part Number
HD6477021X20V
Description
MCU 5V 32K PB-FREE 100-TQFP
Manufacturer
Renesas Electronics America
Series
SuperH® SH7020r
Datasheet
1.HD6417020SVX12IV.pdf
(511 pages)
Specifications of HD6477021X20V
Core Processor
SH-1
Core Size
32-Bit
Speed
20MHz
Connectivity
EBI/EMI, SCI
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
32
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
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
100-TQFP, 100-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HD6477021X20V
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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6.5.3
If a break is attempted at the task A return destination instruction fetch, task B is activated before
the UBC interrupt by interrupt B generated during task A processing, and the UBC interrupt is
handled after the interrupt B exception handling.
(1) Cause
The SH7032/SH7034 chip operates as follows.
It actually takes at least two cycles for the UBC interrupt generated by the address 0x00011a0c
instruction fetch cycle to be sent to the interrupt controller and interrupt exception handling to
begin. However, as shown in figure 6.3, when the UBC interrupt is generated, previously
generated interrupt B initiated by task B is accepted first, and the UBC interrupt is accepted after
completion of the interrupt B exception handling.
(2) Remedy
There is no way of preventing this operation by hardware. A software solution, such as the use of
a flag, must be employed.
Break
condition
Instruction Fetch Break
0x02000030
0x00011a0a
0x00011a0c
<Address>
(0xf000978 Overrun fetch)
0xf000974
Interrupt B accepted
Instruction replaced by interrupt
exception handling
Task B first instruction fetch
UBC first instruction fetch
Overrun fetch
<Description>
(instruction replaced by interrupt
exception handling)
F D
Figure 6.3
F
E E
Interrupt exception
handling
M M E
UBC Operation
UBC interrupt accepted
M E E
F
D E E
f
Interrupt exception
M M
handling
E
RENESAS 87
M
E E
F
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