DF2345TE20 Renesas Electronics America, DF2345TE20 Datasheet - Page 119

• 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

4.2.3
The H8S/2345 Group enters the reset state when the RES pin goes low.
To ensure that the H8S/2345 Group is reset, hold the RES pin low for at least 20 ms at power-up.
To reset the H8S/2345 Group during operation, hold the RES pin low for at least 20 states.
When the RES pin goes high after being held low for the necessary time, the H8S/2345 Group
starts reset exception handling as follows:
1. The internal state of the CPU and the registers of the on-chip supporting modules are
2. The reset exception handling vector address is read and transferred to the PC, and program
Figures 4.2 and 4.3 show examples of the reset sequence.
initialized, the T bit is cleared to 0 in EXR, and the I bit is set to 1 in EXR and CCR.
execution starts from the address indicated by the PC.
RES
Internal
address bus
Internal read
signal
Internal write
signal
Internal data
bus
(1) Reset exception handling vector address ((1) = H'0000)
(2) Start address (contents of reset exception handling vector address)
(3) Start address ((3) = (2))
(4) First program instruction
Reset Sequence
Figure 4.2 Reset Sequence (Modes 2 and 3)
Vector
fetch
(1)
(2)
Internal
processing
High
Rev. 4.00 Feb 15, 2006 page 93 of 900
Prefetch of first program
instruction
Section 4 Exception Handling
(3)
(4)
REJ09B0291-0400