參數(shù)資料
型號： MC68HC705JJ7CDW
廠商： Freescale Semiconductor
文件頁數(shù)： 7/164頁
文件大?。?/td> 0K
描述： IC MCU 8BIT 20-SOIC
標(biāo)準(zhǔn)包裝： 38
系列： HC05
核心處理器： HC05
芯體尺寸： 8-位
速度： 2.1MHz
連通性： SIO
外圍設(shè)備： POR，溫度傳感器，WDT
輸入/輸出數(shù)： 14
程序存儲器容量： 6KB（6K x 8）
程序存儲器類型： OTP
RAM 容量： 224 x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 4x12b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 20-SOIC（0.295"，7.50mm 寬）
包裝： 管件
Core Timer
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
104
Freescale Semiconductor
periodically by a program sequence. Writing a logic 0 to COPC bit in the COPR register clears the COP
watchdog and prevents a COP reset.
EPMSEC — EPROM Security((1)) Bit
The EPMSEC bit is a write-only security bit to protect the contents of the user EPROM code stored in
locations $0700–$1FFF.
OPT — Optional Features Bit
The OPT bit enables two additional features: direct drive by comparator outputs to port A and voltage
offset capability to sample capacitor in analog subsystem.
1 = Optional features enabled
0 = Optional features disabled
COPC — COP Clear Bit
This write-only bit resets the COP watchdog. The COP watchdog is active in the run, wait, and halt
modes of operation if the COP is enabled by setting the COPEN bit in the MOR. The STOP instruction
disables the COP watchdog by clearing the counter and turning off its clock source.
In applications that depend on the COP watchdog, the STOP instruction can be disabled by setting the
SWAIT bit in the MOR. In applications that have wait cycles longer than the COP timeout period, the
COP watchdog can be disabled by clearing the COPEN bit. Table 10-2 summarizes recommended
conditions for enabling and disabling the COP watchdog.
NOTE
If the voltage on the IRQ/VPP pin exceeds 1.5 × VDD, the COP watchdog
turns off and remains off until the IRQ/VPP pin voltage falls below
1.5
× VDD.
Address:
$1FF0
Bit 7
6
5
4321
Bit 0
Read:
OPT
Write:
EPMSEC
COPC
Reset:
Unaffected by reset
= Unimplemented
Figure 10-4. COP and Security Register (COPR)
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the EPROM/OTPROM
difficult for unauthorized users.
Table 10-2. COP Watchdog Recommendations
Voltage on
IRQ/VPP Pin
SWAIT
(in MOR)(1)
1. The SWAIT bit in the MOR converts STOP instructions to HALT instructions.
Wait/Halt Time
Recommended COP
Watchdog Condition
Less than 1.5
× VDD
1
Less than COP
timeout period
Enabled(2)
2. Reset the COP watchdog immediately before executing the WAIT/HALT instruction.
Less than 1.5
× VDD
1
Greater than COP
timeout period
Disabled
Less than 1.5
× VDD
0
X(3)
3. Don’t care
Disabled
More than 1.5
× VDD
X
X(3)
Disabled
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