DF2166VTE33 Renesas Electronics America, DF2166VTE33 Datasheet - Page 189

• Manufacturer Part Number: DF2166VTE33
• Description: MCU FLASH 3V 512K 33MHZ 144TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2166VTE33

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 33MHz
• Connectivity: I²C, IrDA, LPC, SCI, SmartCard
• Peripherals: POR, PWM, WDT
• Number Of I /o: 106
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 40K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 144-TQFP, 144-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

6.7
When this LSI accesses the external address space, it can insert a 1-state idle cycle (T
bus cycles when a write cycle occurs immediately after a read cycle. By inserting an idle cycle it is
possible, for example, to avoid data collisions between ROM with a long output floating time, and
high-speed memory and I/O interfaces.
If an external write occurs after an external read while the ICIS bit is set to 1 in BCR, an idle cycle
is inserted at the start of the write cycle.
Figure 6.29 shows examples of idle cycle operation. In these examples, bus cycle A is a read cycle
for ROM with a long output floating time, and bus cycle B is a CPU write cycle. In figure 6.29 (a),
with no idle cycle inserted, a collision occurs in bus cycle B between the read data from ROM and
the CPU write data. In figure 6.29 (b), an idle cycle is inserted, thus preventing data collision.
Table 6.17 shows the pin states in an idle cycle.
Table 6.17 Pin States in Idle Cycle
Pins
A23 to A0
D15 to D0
AS, IOS, CS256, CPCS1
RD
HWR, LWR
Address bus
Idle Cycle
Data bus
WR
RD
φ
(a) No idle cycle insertion
T
1
Bus cycle A
Long output floating time
Figure 6.29 Examples of Idle Cycle Operation
T
2
T
3
Bus cycle B
T
1
T
2
Data collision
Pin State
Contents of immediately following bus cycle
High impedance
High
High
High
Address bus
Data bus
RD
WR
φ
T
1
Bus cycle A
Rev. 3.00, 03/04, page 147 of 830
T
(b) Idle cycle insertion
2
T
3
T
I
Bus cycle B
T
1
I
) between
T
2