MC68HC908JL3ECFA Freescale Semiconductor, MC68HC908JL3ECFA Datasheet - Page 33

• Manufacturer Part Number: MC68HC908JL3ECFA
• Description: IC MCU 4K FLASH 8MHZ 48-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908JL3ECFA

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Peripherals: LED, LVD, POR, PWM
• Number Of I /o: 23
• 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: 48-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Connectivity: -

2.12 Flash Block Protect Register
The Flash Block Protect Register is implemented as an 8-bit I/O register. The value in this register
determines the starting address of the protected range within the Flash memory.
BPR[7:0] — Flash Block Protect Register Bit 7 to Bit 0
Freescale Semiconductor
BPR[7:1] represent bits [12:6] of a 16-bit memory address. Bits [15:13] are 1’s and bits [5:0] are 0’s.
BPR0 is used only for BPR[7:0] = $FF, for no block protection.
The resultant 16-bit address is used for specifying the start address of the Flash memory for block
protection. The Flash is protected from this start address to the end of Flash memory, at $FFFF. With
this mechanism, the protect start address can be XX00, XX40, XX80, or XXC0 (at page boundaries —
64 bytes) within the Flash memory.
Examples of protect start address:
Address:
Reset:
Read:
Write:
Start address of Flash block protect
and so on...
Note:
The end address of the protected range is always $FFFF.
$FE09
BPR7
(0110 001x)
(0110 010x)
(0110 100x)
$DE or $DF
(1101 111x)
(1111 1110)
Bit 7
$62 or $63
$64 or $65
$68 or $69
BPR[7:0]
0
$00–$60
Figure 2-6. Flash Block Protect Register (FLBPR)
$FE
$FF
BPR6
MC68HC908JL3E Family Data Sheet, Rev. 4
6
0
BPR5
5
0
The entire Flash memory is not protected.
The entire Flash memory is protected.
Start of Address of Protect Range
BPR4
$FBC0 (1111 1011 1100 0000)
$EC40 (1110 1100 0100 0000)
$EC80 (1110 1100 1000 0000)
$ED00 (1110 1101 0000 0000)
$FFC0 (1111 1111 1100 0000)
1 1 1
4
0
BPR3
3
0
16-bit memory address
BPR[7:1]
BPR2
2
0
BPR1
0 0 0 0 0 0
1
0
Flash Block Protect Register
BPR0
Bit 0
0
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