DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 100

• Manufacturer Part Number: DF2437FV
• Description: IC H8S/2437 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2400r

Specifications of DF2437FV

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

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).
4.3.3
After reset release, the module stop control register (MSTPCR, EXMSTPCR) is initialized and all
modules enter module stop mode.
Consequently, on-chip peripheral module registers cannot be read or written to. Register reading
and writing is enabled when module stop mode is exited.
Rev.2.00 May. 28, 2009 Page 60 of 732
REJ09B0059-0200
(1)(3) Reset exception-handling vector address (when reset, (1)=H'000000, (3)=H'000002)
(2)(4) Start address (contents of reset exception-handling vector address)
(5)
(6)
Interrupts after Reset
On-Chip Peripheral Functions after Reset Release
Internal
address bus
Internal read
signal
Internal write
signal
Internal data
bus
φ
Start address ((5)=(2)(4))
First program instruction
Figure 4.1 Reset Sequence
(1)
Vector fetch
(2)
High
(4)
Internal
processing
(3)
Prefetch of first
program instruction
(5)
(6)