參數(shù)資料
型號: W78ERD2A40FL
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44
封裝: ROHS COMPLIANT, PLASTIC, QFP-44
文件頁數(shù): 59/76頁
文件大小: 650K
代理商: W78ERD2A40FL
W78ERD2/W78ERD2A
Publication Release Date: February 14, 2007
- 59 -
Revision A10
MOVC Inhibit
This bit is used to restrict the accessible region of the MOVC instruction. It can prevent a MOVC
instruction in external program memory from reading the internal program code. When this bit is set to
logic-0, a MOVC instruction in external program memory space can only access code in external
memory, not in internal memory. A MOVC instruction in internal program memory can always access
both internal and external memory. If this bit is logic-1, there are no restrictions on MOVC.
Encryption
This bit is used to enable and disable the encryption logic for code protection. Once encryption is
enabled, the data presented on port 0 is encoded via encryption logic. This bit can be reset only by
erasing the whole chip.
Oscillator Control
The gain of the on-chip oscillator amplifier can be reduced by bit B7 in the option bits register. If bit 7
is set to zero, the gain is cut in half.
According the circuit in
Figure 20-1
, the values of R, C1 and C2 may need some adjustment when
running at lower gain. Furthermore, reducing the gain by one-half may improperly affect an external
crystal running at frequencies above 25 MHz.
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