D12321VF25V Renesas Electronics America, D12321VF25V Datasheet - Page 220

• Manufacturer Part Number: D12321VF25V
• Description: IC H8S/2300 MCU ROMLESS 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of D12321VF25V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: POR, PWM, WDT
• Number Of I /o: 86
• Program Memory Type: ROMless
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• For Use With: EDK2329 - DEV EVALUATION KIT H8S/2329
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

Section 6 Bus Controller
6.5.8
Wait Control
There are two ways of inserting wait states in a DRAM access cycle: program wait insertion and
pin wait insertion using the WAIT pin.
Program Wait Insertion: When the bit in ASTCR corresponding to an area designated as DRAM
space is set to 1, from 0 to 3 wait states can be inserted automatically between the T
state and T
c1
c2
state, according to the settings of WCRH and WCRL.
Pin Wait Insertion: When the WAITE bit in BCRH is set to 1, wait input by means of the WAIT
pin is enabled regardless of the setting of the AST bit in ASTCR. When DRAM space is accessed
in this state, a program wait is first inserted. If the WAIT pin is low at the falling edge of φ in the
state is inserted. If the WAIT pin is held low, T
last T
or T
state, another T
states are inserted
c1
w
w
w
until it goes high.
Figure 6.17 shows an example of wait state insertion timing.
Rev.6.00 Sep. 27, 2007 Page 188 of 1268
REJ09B0220-0600