DF2345TE20 Renesas Electronics America, DF2345TE20 Datasheet - Page 183

• Manufacturer Part Number: DF2345TE20
• Description: MCU 5V 128K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2345TE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: POR, PWM, WDT
• Number Of I /o: 71
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 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: HD64F2345TE20; HD64F2345TE20

Section 6 Bus Controller
6.4.5
Wait Control
When accessing external space, the H8S/2345 Group can extend the bus cycle by inserting one or
more wait states (T
). There are two ways of inserting wait states: program wait insertion and pin
w
wait insertion using the WAIT pin.
Program Wait Insertion
From 0 to 3 wait states can be inserted automatically between the T
state and T
state on an
2
3
individual area basis in 3-state access space, according to the settings of BWCRH and BWCRL.
Pin Wait Insertion
Setting the WAITE bit in BCRL to 1 enables wait insertion by means of the WAIT pin. Program
wait insertion is first carried out according to the settings in WCRH and WCRL. Then, if the
WAIT pin is low at the falling edge of in the last T
or T
state, a T
state is inserted. If the
2
w
w
WAIT pin is held low, T
states are inserted until it goes high.
w
This is useful when inserting four or more T
states, or when changing the number of T
states for
w
w
different external devices.
The WAITE bit setting applies to all areas.
Rev. 4.00 Feb 15, 2006 page 157 of 900
REJ09B0291-0400