MC908QL4MDT Freescale Semiconductor, MC908QL4MDT Datasheet - Page 192

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MC908QL4MDT

Manufacturer Part Number
MC908QL4MDT
Description
IC MCU 8BIT 4K FLASH 16-TSSOP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet

Specifications of MC908QL4MDT

Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
LIN (Local Interconnect Network)
Peripherals
LVD, POR, PWM
Number Of I /o
13
Program Memory Size
4KB (4K x 8)
Program Memory Type
FLASH
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 6x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
16-TSSOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-

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Development Support
16.2.3 Low-Power Modes
The WAIT and STOP instructions put the MCU in low power-consumption standby modes. If enabled, the
break module will remain enabled in wait and stop modes. However, since the internal address bus does
not increment in these modes, a break interrupt will never be triggered.
16.3 Monitor Module (MON)
The monitor module allows debugging and programming of the microcontroller unit (MCU) through a
single-wire interface with a host computer. Monitor mode entry can be achieved without use of the higher
test voltage, V
requirements for in-circuit programming.
Features include:
16.3.1 Functional Description
Figure 16-9
The monitor module receives and executes commands from a host computer.
and
computer via a standard RS-232 interface.
Simple monitor commands can access any memory address. In monitor mode, the MCU can execute
code downloaded into RAM by a host computer while most MCU pins retain normal operating mode
functions. All communication between the host computer and the MCU is through the PTA0 pin. A
level-shifting and multiplexing interface is required between PTA0 and the host computer. PTA0 is used
in a wired-OR configuration and requires a pullup resistor.
The monitor code has been updated from previous versions of the monitor code to allow enabling the
internal oscillator to generate the internal clock. This addition, which is enabled when IRQ is held low out
of reset, is intended to support serial communication/programming at 9600 baud in monitor mode by using
the internal oscillator, and the internal oscillator user trim value OSCTRIM (FLASH location $FFC0, if
programmed) to generate the desired internal frequency (3.2 MHz). Since this feature is enabled only
when IRQ is held low out of reset, it cannot be used when the reset vector is programmed (i.e., the value
is not $FFFF) because entry into monitor mode in this case requires V
remain low during this monitor session in order to maintain communication.
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the FLASH difficult for
192
unauthorized users.
Figure 16-12
Normal user-mode pin functionality
One pin dedicated to serial communication between MCU and host computer
Standard non-return-to-zero (NRZ) communication with host computer
Standard communication baud rate (7200 @ 2-MHz bus frequency)
Execution of code in random-access memory (RAM) or FLASH
FLASH memory security feature
FLASH memory programming interface
Use of external 9.8304 MHz crystal or clock to generate internal frequency of 2.4576 MHz
Simple internal oscillator mode of operation (no external clock or high voltage)
Monitor mode entry without high voltage, V
$FF)
Normal monitor mode entry if V
shows a simplified diagram of monitor mode entry.
TST
, as long as vector addresses $FFFE and $FFFF are blank, thus reducing the hardware
show example circuits used to enter monitor mode and communicate with a host
MC68HC908QL4 Data Sheet, Rev. 8
TST
(1)
is applied to IRQ
TST
, if reset vector is blank ($FFFE and $FFFF contain
TST
on IRQ. The IRQ pin must
Figure
Freescale Semiconductor
16-10,
Figure
16-11,

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