參數(shù)資料
型號： MC68HC705L16CFU
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝： PLASTIC, QFP-80
文件頁數(shù)： 60/146頁
文件大?。?/td> 852K
代理商： MC68HC705L16CFU
General Description
MC68HC05L16 MC68HC705L16 Data Sheet, Rev. 4.1
20
Freescale Semiconductor
1.5.9 Port E (PE0–PE7/FP38–FP35)
Port E is an 8-bit output-only port that shares its bits with LCD frontplane drivers. Port E lines are
configured as LCD outputs during power-on or reset. PE0–PE3 and PE4–PE7 outputs may be configured
as open-drain outputs by a software option.
1.5.10 VLCD1, VLCD2, and VLCD3
These pins provide offset to the LCD driver bias for adjusting the contrast of the LCD.
1.5.11 NDLY
This pin is reserved for factory test and should be connected to VDD in single-chip mode (user mode).
1.6 Modes of Operation
The MC68HC05L16 has two operating modes:
Single-chip mode (SCM)
Self-check mode
Single-chip mode, also called user mode, allows maximum use of pins for on-chip peripheral functions.
The self-check capability of MC68HC05L16 provides an internal check to determine if the device is
functional.
1.6.1 Mode Entry
Mode entry is done at the rising edge of the RESET pin. Once the device enters one of the modes, the
mode cannot be changed by software. Only an external reset can change the mode.
At the rising edge of the RESET pin, the device latches the states of IRQ1 and IRQ2 and places itself in
the specified mode. While the RESET pin is low, all pins are configured as single-chip mode. Table 1-2
shows the states of IRQ1 and IRQ2 for each mode entry.
High voltage VTST = 2 x VDD is required to select modes other than single-chip mode.
Table 1-2. Mode Select Summary
Modes
RESET
PC6/IRQ1
PC7/IRQ2
Single-Chip (User) Mode
VSS or VDD
Self-Check Mode
VTST
VDD
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