MC68908GZ8MFAE Freescale Semiconductor, MC68908GZ8MFAE Datasheet - Page 280

IC MCU 8BIT 8K FLASH 48-LQFP

MC68908GZ8MFAE

Manufacturer Part Number
MC68908GZ8MFAE
Description
IC MCU 8BIT 8K FLASH 48-LQFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet

Specifications of MC68908GZ8MFAE

Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
CAN, LIN, SCI, SPI
Peripherals
LVD, POR, PWM
Number Of I /o
37
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
48-LQFP
Processor Series
M689xx
Core
HC08
Data Bus Width
8 bit
Data Ram Size
1 KB
Interface Type
SPI, SCI, CAN
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
37
Number Of Timers
2
Operating Supply Voltage
5.5 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Development Tools By Supplier
FSICEBASE, M68CBL05AE, DEMO908GZ60E, M68EML08GZE
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 16 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
 Details
Development Support
Enter monitor mode with pin configuration shown in
rising edge of RST latches monitor mode. Once monitor mode is latched, the values on the specified pins
can change.
Once out of reset, the MCU waits for the host to send eight security bytes (see
security bytes, the MCU sends a break signal (10 consecutive logic 0s) to the host, indicating that it is
ready to receive a command.
20.3.1.1 Normal Monitor Mode
If V
of the input clock. If PTB4 is high with V
will be a divide-by-four of the input clock. Holding the PTB4 pin low when entering monitor mode causes
a bypass of a divide-by-two stage at the oscillator only if V
CGMOUT frequency is equal to the CGMXCLK frequency, and the OSC1 input directly generates internal
bus clocks. In this case, the OSC1 signal must have a 50% duty cycle at maximum bus frequency.
When monitor mode was entered with V
as long as V
This condition states that as long as V
V
then the COP will be disabled. In the latter situation, after V
removed from the IRQ pin in the interest of freeing the IRQ for normal functionality in monitor mode.
20.3.1.2 Forced Monitor Mode
If entering monitor mode without high voltage on IRQ, then all port B pin requirements and conditions,
including the PTB4 frequency divisor selection, are not in effect. This is to reduce circuit requirements
when performing in-circuit programming.
An external oscillator of 8 MHz is required for a baud rate of 7200, as the internal bus frequency is
automatically set to the external frequency divided by four.
When the forced monitor mode is entered the COP is always disabled regardless of the state of IRQ or
RST.
20.3.1.3 Monitor Vectors
In monitor mode, the MCU uses different vectors for reset, SWI (software interrupt), and break interrupt
than those for user mode. The alternate vectors are in the $FE page instead of the $FF page and allow
code execution from the internal monitor firmware instead of user code.
Table 20-2
280
TST
TST
is applied to RST after the initial reset to get into monitor mode (when V
is applied to IRQ and PTB4 is low upon monitor mode entry, the bus frequency is a divide-by-two
summarizes the differences between user mode and monitor mode.
TST
If the reset vector is blank and monitor mode is entered, the chip will see an
additional reset cycle after the initial power-on reset (POR). Once the reset
vector has been programmed, the traditional method of applying a voltage,
V
TST
is applied to either IRQ or RST.
, to IRQ must be used to enter monitor mode.
MC68HC908GZ16 • MC68HC908GZ8 Data Sheet, Rev. 4
TST
TST
TST
is maintained on the IRQ pin after entering monitor mode, or if
applied to IRQ upon monitor mode entry, the bus frequency
on IRQ, the computer operating properly (COP) is disabled
NOTE
Table 20-1
TST
TST
is applied to IRQ. In this event, the
is applied to the RST pin, V
by pulling RST low and then high. The
TST
20.3.2
was applied to IRQ),
Freescale Semiconductor
Security). After the
TST
can be

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