MC908MR8MPE Freescale Semiconductor, MC908MR8MPE Datasheet - Page 196
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MC908MR8MPE
Manufacturer Part Number
MC908MR8MPE
Description
IC MCU 8BIT 8K FLASH 28-PDIP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MCHC908MR8VFAE.pdf
(372 pages)
Specifications of MC908MR8MPE
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 ~ 125°C
Package / Case
28-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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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
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