MC9S08RD32CDWE Freescale Semiconductor, MC9S08RD32CDWE Datasheet - Page 31

• 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

3.6
One of three stop modes is entered upon execution of a STOP instruction when the STOPE bit in the
system option register is set. In all stop modes, all internal clocks are halted. If the STOPE bit is not set
when the CPU executes a STOP instruction, the MCU will not enter any of the stop modes and an illegal
opcode reset is forced. The stop modes are selected by setting the appropriate bits in SPMSC2.
Table 3-1
3.6.1
Stop1 mode provides the lowest possible standby power consumption by causing the internal circuitry of
the MCU to be powered down. To enter stop1, the user must execute a STOP instruction with the PDC bit
in SPMSC2 set and the PPDC bit clear. Stop1 can be entered only if the LVD reset is disabled
(LVDRE = 0).
When the MCU is in stop1 mode, all internal circuits that are powered from the voltage regulator are turned
off. The voltage regulator is in a low-power standby state, as are the OSC and ACMP.
Exit from stop1 is done by asserting any of the wakeup pins on the MCU: RESET, IRQ, or KBI1, which
have been enabled. IRQ and KBI pins are always active-low when used as wakeup pins in stop1 regardless
of how they were configured before entering stop1.
Upon wakeup from stop1 mode, the MCU will start up as from a power-on reset (POR). The CPU will take
the reset vector.
3.6.2
Stop2 mode provides very low standby power consumption and maintains the contents of RAM and the
current state of all of the I/O pins. To select entry into stop2 upon execution of a STOP instruction, the user
must execute a STOP instruction with the PPDC and PDC bits in SPMSC2 set. Stop2 can be entered only
if LVDRE = 0.
Before entering stop2 mode, the user must save the contents of the I/O port registers, as well as any other
memory-mapped registers that they want to restore after exit of stop2, to locations in RAM. Upon exit from
stop2, these values can be restored by user software.
When the MCU is in stop2 mode, all internal circuits that are powered from the voltage regulator are turned
off, except for the RAM. The voltage regulator is in a low-power standby state, as is the ACMP. Upon entry
Freescale Semiconductor
Mode
Stop1
Stop2
Stop3
Stop Modes
summarizes the behavior of the MCU in each of the stop modes.
PDC
Stop1 Mode
Stop2 Mode
1
1
0
PPDC
Don’t
care
0
1
CPU, Digital
Peripherals,
Standby
FLASH
Off
Off
MC9S08RC/RD/RE/RG Data Sheet, Rev. 1.11
Table 3-1. Stop Mode Behavior
Standby
Standby
RAM
Off
OSC
Off
Off
Off
Standby
Standby
Standby
ACMP
Regulator
Standby
Standby
Standby
I/O Pins
States
States
Reset
held
held
Modes of Operation
Optionally on
Optionally on
RTI
Off
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