W78E516DDG Datasheet, PDF (71/90 Pages) Nuvotem Talema – 8-BIT MICROCONTROLLER

W78E516D/W78E058D Data Sheet
can only be reset through erase-all operation. The contents of the Company ID and Device ID regis-
ters have been set in factory.
B7 B6 B5 B4 B3 B2 B1 B0
B 0 : L o ck b it
lo g ic 0 : E n a b le , a ll o f th e A P R O M /L D R O M /C o n fig
B its w ill b e lo cke d .
B 1 : M O V C in h ib it
lo g ic 0 : T h e M O V C in stru ctio n in e xte rn a l m e m o ry
ca n n o t a cce ss th e co d e in in te rn a l m e m o ry
lo g ic 1 : n o re strictio n .
B 5 : M a ch in e C ycle S e le ct
lo g ic 0 : 6 T
lo g ic 1 : 1 2 T
B 7 : O scilla to r C o n tro l
lo g ic 0 : 1 /2 g a in
lo g ic 1 : F u ll g a in
D e fa u lt 1 fo r a ll se cu rity b its .
R e se rve d b its m u st b e ke p t in lo g ic 1 .
C o n fig B its
Bit 0: Lock bits
This bit is used to protect the customer's program code in the W78E516D/W78E058D. It may be set
after the programmer finishes the programming and verifies sequence. Once these bits are set to logic
0, both the FLASH data and Special Setting Registers can not be accessed again.
Bit 1: Movc inhibit
This bit is used to restrict the accessible region of the MOVC instruction. It can prevent the MOVC in-
struction 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 will be able to access code only in the
external memory, not in the internal memory. A MOVC instruction in internal program memory space
will always be able to access the ROM data in both internal and external memory. If this bit is logic 1,
there are no restrictions on the MOVC instruction.
Bit 5: Machine Cycle Select
This bit is select MCU core, default value is logic 1(12T). Once these bits are set to logic 0, the MCU
core is 6T.
Bit 7: Crystal Select
If this bit is set to logic 0 (24 MHz), the EMI effect will be reduce. If this bit is set to logic 1 (40 MHz ),
the W78E516D/W78E058D could to use 40MHz crystal, but the EMI effect is major. So we provide the
option bit which could be chose by customer.
- 71 -
Publication Release Date: Feb 15, 2011
Revision A09