HD6477021X20V Renesas Electronics America, HD6477021X20V Datasheet - Page 81
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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4.8
4.8.1
An address error occurs if the stack is accessed for exception processing when the value of the
stack pointer (SP) is not a multiple of four. Therefore, a multiple of four should always be stored
in SP.
4.8.2
An address error occurs if the vector table is accessed for exception processing when the value of
the vector base register (VBR) is not a multiple of four. Therefore, VBR should always be set to a
multiple of four.
4.8.3
When the stack pointer is not a multiple of four, address errors will occur in the exception
processing (interrupt, etc.) stacking. After the exception processing ends, the CPU will then shift
to address error exception processing. An address error will also occur during the address error
exception processing stacking, but the CPU is set up to ignore the address error so that it can avoid
an infinite series of address errors. This allows it to shift program control to the address error
exception service routine and process the error.
When an address error does occur in exception processing stacking, the stacking bus cycle (write)
is executed. In SR and PC stacking, four is subtracted from each of the SPs so the SP values are
not multiples of four after stacking either. Since the address value output during stacking is the SP
value, the address that produced the error is exactly what is output. In such cases, the stacked write
data will be undefined.
Notes
Value of the Stack Pointer (SP)
Value of the Vector Base Register (VBR)
Address Errors that Are Caused by Stacking During Address Error Exception
Processing
RENESAS 59
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