DF2238RTF6 Renesas Electronics America, DF2238RTF6 Datasheet - Page 260

• Manufacturer Part Number: DF2238RTF6
• Description: MCU 2.2/3V 256K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2200r

Specifications of DF2238RTF6

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 6MHz
• Connectivity: I²C, SCI, SmartCard
• Peripherals: POR, PWM, WDT
• Number Of I /o: 72
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F2238RTF6; HD64F2238RTF6

Section 7 Bus Controller
Figure 7.24 shows the timing for transition to the bus-released state.
7.9.1
When MSTPCR is set to H'FFFFFF and transmitted to sleep mode, the external bus release does
not function. To activate the external bus release in sleep mode, do not set MSTPCR to H'FFFFFF.
Rev. 6.00 Mar. 18, 2010 Page 198 of 982
REJ09B0054-0600
Address bus
HWR, LWR
Data bus
Bus Release Usage Note
Note : n = 7 to 0
[1]
[2]
[3]
[4]
[5]
BREQ
BACK
CSn
RD
AS
φ
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.
Figure 7.24 Bus-Released State Transition Timing
T
0
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
High impedance
[4]
CPU
cycle
[5]