DF61657CN35FTV Renesas Electronics America, DF61657CN35FTV Datasheet - Page 104
DF61657CN35FTV
Manufacturer Part Number
DF61657CN35FTV
Description
IC H8SX/1657 MCU FLASH 120TQFP
Manufacturer
Renesas Electronics America
Series
H8® H8SX/1600r
Datasheet
1.DF61656N35FTV.pdf
(894 pages)
Specifications of DF61657CN35FTV
Core Processor
H8SX
Core Size
32-Bit
Speed
35MHz
Connectivity
SCI, SmartCard
Peripherals
DMA, PWM, WDT
Number Of I /o
82
Program Memory Size
768KB (768K x 8)
Program Memory Type
FLASH
Ram Size
24K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 8x10b; D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
120-TQFP, 120-VQFP
For Use With
3DK1657 - DEV EVAL KIT FOR H8SX/1657
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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Section 4 Exception Handling
4.3
A reset has priority over any other exception. When the RES pin goes low, all processing halts and
this LSI enters the reset state. To ensure that this LSI is reset, hold the RES pin low for at least 20
ms with the STBY pin driven high when the power is turned on. When operation is in progress,
hold the RES pin low for at least 20 cycles.
The chip can also be reset by overflow of the watchdog timer. For details, see section 13,
Watchdog Timer (WDT).
A reset initializes the internal state of the CPU and the registers of the on-chip peripheral modules.
The interrupt control mode is 0 immediately after a reset.
4.3.1
When the RES pin goes high after being held low for the necessary time, this LSI starts reset
exception handling as follows:
1. The internal state of the CPU and the registers of the on-chip peripheral modules are
2. The reset exception handling vector address is read and transferred to the PC, and program
Figures 4.1 and 4.2 show examples of the reset sequence.
4.3.2
If an interrupt is accepted after a reset but before the stack pointer (SP) is initialized, the PC and
CCR will not be saved correctly, leading to a program crash. To prevent this, all interrupt requests,
including NMI, are disabled immediately after a reset. Since the first instruction of a program is
always executed immediately after the reset state ends, make sure that this instruction initializes
the stack pointer (example: MOV.L #xx: 32, SP).
Rev. 2.00 Jun. 28, 2007 Page 78 of 864
REJ09B0341-0200
initialized, VBR is cleared to H'00000000, the T bit is cleared to 0 in EXR, and the I bits are
set to 1 in EXR and CCR.
execution starts from the address indicated by the PC.
Reset
Reset Exception Handling
Interrupts after Reset
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