DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 650

• Manufacturer Part Number: DF2437FV
• Description: IC H8S/2437 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2400r

Specifications of DF2437FV

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

(2) Bit-Rate-Adjustment State
The bit rate is calculated by measuring the period of transfer of a low-level byte (H'00) from the
host. The bit rate can be changed by the command for a new bit rate selection. After the bit rate
has been adjusted, the boot program enters the inquiry/selection state. The bit-rate-adjustment
sequence is shown in figure 20.20.
(3) Communication Protocol
After adjustment of the bit rate, the protocol for serial communications between the host and the
boot program is as shown below.
1. One-Byte Commands and One-Byte Responses
2. n-Byte Commands or n-Byte Responses
3. Error Response
4. Programming of 128 Bytes
5. Memory Read Response
Rev.2.00 May. 28, 2009 Page 610 of 732
REJ09B0059-0200
These commands and responses are comprised of a single byte. These are consists of the
inquiries and the ACK for successful completion.
These commands and responses are comprised of n bytes of data. These are selections and
responses to inquiries.
The amount of programming data is not included under this heading because it is determined
in another command.
The error response is a response to inquiries. It consists of two bytes: an error response and an
error code.
The size is not specified in commands. The size is indicated in response to the programming
unit inquiry.
This response consists of four bytes.
Host
Figure 20.20 Bit-Rate-Adjustment Sequence
H'00 (Completion of adjustment)
H'E6 (Boot response)
H'00 (30 times maximum)
(H'FF (error))
H'55
Boot Program
Measuring the
1-bit length