MC908JB8ADWE Freescale Semiconductor, MC908JB8ADWE Datasheet - Page 166

• Manufacturer Part Number: MC908JB8ADWE
• Description: IC MCU 3MHZ 8K FLASH 28-SOIC
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC908JB8ADWE

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 3MHz
• Connectivity: USB
• Peripherals: LVD, POR, PWM
• Number Of I /o: 21
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SOIC (7.5mm Width)
• Processor Series: HC08JB
• Core: HC08
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: USB
• Maximum Clock Frequency: 3 MHz
• Number Of Programmable I/os: 37
• Number Of Timers: 2
• Operating Supply Voltage: 5.25 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: FSICEBASE, DEMO908GZ60E, M68EML08GZE, KITUSBSPIDGLEVME, KITUSBSPIEVME, KIT33810EKEVME
• Minimum Operating Temperature: 0 C
• Controller Family/series: HC08
• No. Of I/o's: 21
• Ram Memory Size: 256Byte
• Cpu Speed: 8MHz
• No. Of Timers: 1
• Embedded Interface Type: SCI, SPI
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Monitor ROM (MON)
10.4.1 Entering Monitor Mode
Technical Data
166
V
V
DD
DD
Notes:
1. PTA3 = 0: Bypasses the divide-by-two prescaler to SIM when using V
2. See
V
V
DD
DD
+ V
+ V
Section 18. Electrical Specifications
HI
HI
(contain
BLANK
BLANK
$FF)
NOT
X
X
Table 10-1. Mode Entry Requirements and Options
X
X
0
1
Table 10-1
specified in the table, monitor mode may be entered after a POR and will
allow communication at 9600 baud provided one of the following sets of
conditions is met:
1. If IRQ = V
2. If IRQ = V
3. If $FFFE & $FFFF is blank (contains $FF):
X
X
0
0
– External clock on OSC1 is 3MHz
– PTA3 = low
– External clock on OSC1 is 6MHz
– PTA3 = high
– External clock on OSC1 is 6MHz
– IRQ = V
X
X
1
1
X
1
1
1
shows the pin conditions for entering monitor mode. As
for V
Monitor ROM (MON)
External Clock,
DD
DD
DD
DD
+ V
+ V
+ V
3MHz
6MHz
6MHz
6MHz
f
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
XCLK
HI
voltage level requirements.
HI
HI
:
:
DD
Frequency,
(f
(f
(f
+ V
XCLK
XCLK
XCLK
(f
3MHz
3MHz
3MHz
3MHz
f
Bus
XCLK
BUS
HI
for monitor mode entry.
÷ 2)
÷ 2)
÷ 2)
)
High-voltage entry to
monitor mode.
9600 baud communication
on PTA0. COP disabled.
Low-voltage entry to
monitor mode.
9600 baud communication
on PTA0. COP disabled.
Enters user mode.
If $FFFE and $FFFF is
blank, MCU will encounter
an illegal address reset.
Freescale Semiconductor
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