MC68HC908MR8CP Freescale Semiconductor, MC68HC908MR8CP Datasheet - Page 196

• Manufacturer Part Number: MC68HC908MR8CP
• Description: IC MCU 8K FLASH 8MHZ PWM 28-DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908MR8CP

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 12
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Monitor ROM (MON)
10.5 Security
Technical Data
196
NOTE:
A security feature discourages unauthorized reading of ROM locations
while in monitor mode. The host can satisfy the security feature at
monitor mode entry by sending eight security bytes that match the bytes
at locations $FFF6–$FFFD. Locations $FFF6–$FFFD contain
user-defined data.
Do not leave locations $FFF6–$FFFD blank. For security reasons,
program locations $FFF6–$FFFD even if they are not used for vectors.
During monitor mode entry, the MCU waits after the power-on reset for
the host to send the eight security bytes on pin PTB0 (R
received bytes match those at locations $FFF6–$FFFD, the host
satisfies the security feature and can read all ROM locations and
execute code from ROM. Security remains satisfied until a power-on
reset occurs. If the reset was not a power-on reset, security remains
satisfied and security code entry is not required. See
V
RST
PA7
PA0
Notes:
DD
1 = Echo delay, 2 bit times
2 = Data return delay, 2 bit times
4 = Wait 1 bit time before sending next byte.
FROM HOST
FROM MCU
Figure 10-6. Monitor Mode Entry Timing
Monitor ROM (MON)
4096 + 32 CGMXCLK CYCLES
24 BUS CYCLES
1
256 BUS CYCLES (MINIMUM)
4
1
MC68HC908MR8 — Rev 4.1
1
Freescale Semiconductor
Figure
2
X
D). If the
4
10-6.
1