MC9S08RD32CDWE Freescale Semiconductor, MC9S08RD32CDWE Datasheet - Page 30

• Manufacturer Part Number: MC9S08RD32CDWE
• Description: IC MCU 32K FLASH 2K RAM 28-SOIC
• Manufacturer: Freescale Semiconductor
• Series: HCS08r

Specifications of MC9S08RD32CDWE

• Core Processor: HCS08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Processor Series: S08RD
• Core: HCS08
• Data Bus Width: 8 bit
• Data Ram Size: 2 KB
• Interface Type: SCI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 39
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWS08
• Development Tools By Supplier: DEMO9S08RG60E
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

Modes of Operation
After active background mode is entered, the CPU is held in a suspended state waiting for serial
background commands rather than executing instructions from the user’s application program.
Background commands are of two types:
The active background mode is used to program a bootloader or user application program into the FLASH
program memory before the MCU is operated in run mode for the first time. When the
MC9S08RC/RD/RE/RG is shipped from the Freescale Semiconductor factory, the FLASH program
memory is usually erased so there is no program that could be executed in run mode until the FLASH
memory is initially programmed. The active background mode can also be used to erase and reprogram
the FLASH memory after it has been previously programmed.
For additional information about the active background mode, refer to the
3.5
Wait mode is entered by executing a WAIT instruction. Upon execution of the WAIT instruction, the CPU
enters a low-power state in which it is not clocked. The I bit in CCR is cleared when the CPU enters the
wait mode, enabling interrupts. When an interrupt request occurs, the CPU exits the wait mode and
resumes processing, beginning with the stacking operations leading to the interrupt service routine.
Only the BACKGROUND command and memory-access-with-status commands are available when the
MCU is in wait mode. The memory-access-with-status commands do not allow memory access, but they
report an error indicating that the MCU is in either stop or wait mode. The BACKGROUND command can
be used to wake the MCU from wait mode and enter active background mode.
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Non-intrusive commands, defined as commands that can be issued while the user program is
running. Non-intrusive commands can be issued through the BKGD pin while the MCU is in run
mode; non-intrusive commands can also be executed when the MCU is in the active background
mode. Non-intrusive commands include:
— Memory access commands
— Memory-access-with-status commands
— BDC register access commands
— BACKGROUND command
Active background commands, which can only be executed while the MCU is in active background
mode, include commands to:
— Read or write CPU registers
— Trace one user program instruction at a time
— Leave active background mode to return to the user’s application program (GO)
Wait Mode
MC9S08RC/RD/RE/RG Data Sheet, Rev. 1.11
Development Support
Freescale Semiconductor
chapter.