DF2345TE20 Renesas Electronics America, DF2345TE20 Datasheet - Page 191

• 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

6.6.2
Table 6.5 shows pin states in an idle cycle.
Table 6.5
6.7
6.7.1
The H8S/2345 Group can release the external bus in response to a bus request from an external
device. In the external bus released state, the internal bus master continues to operate as long as
there is no external access.
6.7.2
In external expansion mode, the bus can be released to an external device by setting the BRLE bit
in BCRL to 1. Driving the BREQ pin low issues an external bus request to the H8S/2345 Group.
When the BREQ pin is sampled, at the prescribed timing the BACK pin is driven low, and the
address bus, data bus, and bus control signals are placed in the high-impedance state, establishing
the external bus-released state.
In the external bus released state, an internal bus master can perform accesses using the internal
bus. When an internal bus master wants to make an external access, it temporarily defers
activation of the bus cycle, and waits for the bus request from the external bus master to be
dropped.
When the BREQ pin is driven high, the BACK pin is driven high at the prescribed timing and the
external bus released state is terminated.
Pins
A
D
CSn
AS
RD
HWR
LWR
23
15
to A
to D
0
0
Pin States in Idle Cycle
Overview
Operation
Bus Release
Pin States in Idle Cycle
Pin State
Contents of next bus cycle
High impedance
High
High
High
High
High
Rev. 4.00 Feb 15, 2006 page 165 of 900
Section 6 Bus Controller
REJ09B0291-0400