DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 169

• 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: -

2. Pin Wait Mode
3. Pin Auto-Wait Mode
When accessing the external address space, a specified number of wait states T
inserted between the T
edge of φ in the last T
T
Pin wait mode is useful when inserting four or more T
of T
A specified number of wait states T
accessing the external address space if the WAIT pin is low at the falling edge of φ in the last
T
bits. Even if the WAIT pin is held low, T
of states.
Pin auto-wait mode enables the low-speed memory interface only by inputting the chip select
signal to the WAIT pin.
Figure 6.26 shows an example of wait state insertion timing in pin wait mode.
DOW
4
Note: n = 1 to 3
Figure 6.26 Example of Wait State Insertion Timing (Multiplex Extended Mode)
state. The number of wait states T
AD15 to AD8
DOW
AD7 to AD0
states are inserted until it goes high.
states to be inserted for each external device.
φ
4
4
or T
state and T
DOW
T
3
state, another T
T
4
Read Cycle
5
DOW
T
state of data state. If the WAIT pin is low at the falling
DOW
DSW
Data
are inserted between the T
is specified by the settings of the WCn1 and WCn0
T
DOW
DOW
states are inserted only up to the specified number
T
DOW
DOW
state is inserted. If the WAIT pin is held low,
T
5
Data
Data
DOW
Rev.2.00 May. 28, 2009 Page 129 of 732
states, or when changing the number
T
3
T
4
4
state and T
Write Cycle
T
DSW
Data
Data
Data
T
DOW
5
T
REJ09B0059-0200
DOW
state when
DOW
can be
T
5