D12312SVF20V Renesas Electronics America, D12312SVF20V Datasheet - Page 788

• Manufacturer Part Number: D12312SVF20V
• Description: IC H8S/2312S MCU ROMLESS 100QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of D12312SVF20V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: POR, PWM, WDT
• Number Of I /o: 70
• Program Memory Type: ROMless
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-QFP
• For Use With: EDK2329 - DEV EVALUATION KIT H8S/2329
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

Section 17 ROM
17.29
17.29.1 Serial Communication Interface Specification for Boot Mode
Initiating boot mode enables the boot program to communicate with the host by using the internal
SCI. The serial communication interface specification is shown below.
Status
The boot program has three states.
(1) Bit-Rate-Adjustment State
(2) Inquiry/Selection State
(3) Programming/erasing state
These boot program states are shown in figure 17.82.
Rev.7.00 Feb. 14, 2007 page 754 of 1108
REJ09B0089-0700
In this state, the boot program adjusts the bit rate to communicate with the host. Initiating boot
mode enables starting of the boot program and entry to the bit-rate-adjustment state. The
program receives the command from the host to adjust the bit rate. After adjusting the bit rate,
the program enters the inquiry/selection state.
In this state, the boot program responds to inquiry commands from the host. The device name,
clock mode, and bit rate are selected. After selection of these settings, the program is made to
enter the programming/erasing state by the command for a transition to the
programming/erasing state. The program transfers the libraries required for erasure to the on-
chip RAM and erases the user MATs and user boot MATs before the transition.
Programming and erasure by the boot program take place in this state. The boot program is
made to transfer the programming/erasing programs to the on-chip RAM by commands from
the host. Sum checks and blank checks are executed by sending these commands from the
host.
Further Information