D12321VF25V Renesas Electronics America, D12321VF25V Datasheet - Page 244

• 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
6.10.4
Figure 6.37 shows the timing for transition to the bus released state.
Rev.6.00 Sep. 27, 2007 Page 212 of 1268
REJ09B0220-0600
Address bus
HWR, LWR
BREQO *
[1]
[2]
[3]
[4]
[5]
[6]
Note: * Output only when BREQOE is set to 1.
Data bus
BREQ
BACK
Low level of BREQ pin is sampled at rise of T
BACK pin is driven low at end of CPU read cycle, releasing bus to external
bus master.
BREQ pin state is still sampled in external bus released state.
High level of BREQ pin is sampled.
BACK pin is driven high, ending bus release cycle.
BREQO signal goes high 1.5 clocks after BACK signal goes high.
Transition Timing
RD
AS
φ
T
0
Figure 6.37 Bus Released State Transition Timing
CPU cycle
T
Address
1
[1]
Minimum
1 state
T
2
[2]
2
state.
External bus released state
[3]
High impedance
High impedance
High impedance
High impedance
High impedance
[4]
[5]
cycle
CPU
[6]