MC68HRC98JK3ECDW Freescale Semiconductor, MC68HRC98JK3ECDW Datasheet - Page 73

• Manufacturer Part Number: MC68HRC98JK3ECDW
• Description: IC MCU 4K FLASH 8MHZ 20-SOIC
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HRC98JK3ECDW

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Peripherals: LED, LVD, POR, PWM
• Number Of I /o: 15
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 12x8b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Connectivity: -

7.3.1 Entering Monitor Mode
Table 7-1
may be entered after a POR and will allow communication at 9600 baud provided one of the following sets
of conditions is met:
If V
frequency is a divide-by-two of the clock input to OSC1. If PTB3 is high with V
monitor mode entry
OSC1. Holding the PTB3 pin low when entering monitor mode causes a bypass of a divide-by-two stage
at the oscillator only if V
2OSCOUT frequency, and OSC1 input directly generates internal bus clocks. In this case, the OSC1
signal must have a 50% duty cycle at maximum bus frequency.
Freescale Semiconductor
1. PTB3 = 0: Bypasses the divide-by-two prescaler to SIM when using V
2. See
3. For IRQ = V
4. For IRQ = V
1. If IRQ = V
2. If IRQ = V
3. If $FFFE & $FFFF is blank (contains $FF):
TST
V
The OSC1 clock must be 50% duty cycle for this condition.
V
TST
V
V
IRQ
MC68HRC908JL3E/JK3E/JK1E — clock must be EXT OSC.
MC68HC908JL3E/JK3E/JK1E — clock can be EXT OSC or XTAL.
MC68HRC908JL3E/JK3E/JK1E — clock must be RC OSC.
MC68HC908JL3E/JK3E/JK1E — clock can be EXT OSC or XTAL.
TST
DD
DD
–
–
–
–
–
–
Table 16-4. DC Electrical Characteristics (5V)
is applied to IRQ and PTB3 is low upon monitor mode entry
(2)
shows the pin conditions for entering monitor mode. As specified in the table, monitor mode
Clock on OSC1 is 4.9125MHz (EXT OSC or XTAL)
PTB3 = low
Clock on OSC1 is 9.8304MHz (EXT OSC or XTAL)
PTB3 = high
Clock on OSC1 is 9.8304MHz (EXT OSC or XTAL or RC)
IRQ = V
TST
DD
(contain
:
BLANK
BLANK
:
TST
TST
$FF)
NOT
X
X
DD
(Table 7-1
:
:
Table 7-1. Monitor Mode Entry Requirements and Options
TST
X
X
0
1
is applied to IRQ. In this event, the OSCOUT frequency is equal to the
0
0
X
X
condition set 2), the bus frequency is a divide-by-four of the clock input to
MC68HC908JL3E Family Data Sheet, Rev. 4
X
X
1
1
1
1
1
X
OSC1 Frequency
for V
4.9152MHz
9.8304MHz
9.8304MHz
At desired
frequency
TST
voltage level requirements.
TST
for monitor mode entry.
2.4576MHz
2.4576MHz
2.4576MHz
Frequency
(OSC1 ÷ 2)
(OSC1 ÷ 4)
(OSC1 ÷ 4)
OSC1 ÷ 4
Bus
(Table 7-1
TST
High-voltage entry to monitor
mode.
9600 baud communication on
PTB0. COP disabled.
Low-voltage entry to monitor
mode.
9600 baud communication on
PTB0. COP disabled.
Enters User mode.
condition set 1), the bus
applied to IRQ upon
Functional Description
(3)
(4)
Comments
73