DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 167

• 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: -

6.5.5
When accessing the external address space, this LSI can extend the bus cycle by inserting the wait
states (T
WAIT pin, and the combination of program wait and the WAIT pin.
In Normal Extended Mode:
1. Program Wait Mode
2. Pin Wait Mode
3. Pin Auto-Wait Mode
When the external address is accessed in the program wait mode, the T
states which are set by the WCn1 and WCn0 pins of the BCRAn, is always inserted between
the T
A specified number of wait states T
when accessing the external address space. The number of wait states T
settings of the WCn1 and WCn0 bits. If the WAIT pin is low at the falling edge of φ in the last
T
until it goes high.
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
Even if the WAIT pin is held low, T
states.
Pin auto-wait mode enables the low-speed memory interface only by inputting the chip select
signal to the WAIT pin.
Figure 6.25 shows an example of wait state insertion timing in pin wait mode.
The settings after a reset are: 3-state access, 3-state program wait insertion, and WAIT pin
input disabled.
2
2
or T
state. The number of wait states T
W
W
2
). Ways of inserting wait states: Program wait insertion, pin wait insertion using the
states to be inserted for each external device.
Wait Control
and the T
W
state, another T
3
states.
W
state is inserted. If the WAIT pin is held low, T
W
W
W
W
are always inserted between the T
are inserted between the T
states are inserted only up to the specified number of
is specified by the settings of the WCn1 and WCn0 bits.
W
states, or when changing the number
Rev.2.00 May. 28, 2009 Page 127 of 732
2
state and T
W
2
W
of the number of
state and T
is specified by the
W
states are inserted
3
state when
REJ09B0059-0200
3
state