W78E516B Datasheet, PDF (6/26 Pages) Winbond – 8-BIT MICROCONTROLLER

W78E516B
to clear the B7 bit of security register. Once B7 is set to 0, a half of gain will be decreased. Care must
be taken if user attempts to diminish the gain of oscillator amplifier, reducing a half of gain may affect
the external crystal operating improperly at high frequency above 24 MHz. The value of R and C1, C2
may need some adjustment while running at lower gain.
Reset
The external RESET signal is sampled at S5P2. To take effect, it must be held high for at least two
machine cycles while the oscillator is running. An internal trigger circuit in the reset line is used to
deglitch the reset line when the W78E516B is used with an external RC network. The reset logic also
has a special glitch removal circuit that ignores glitches on the reset line. During reset, the ports are
initialized to FFH, the stack pointer to 07H, PCON (with the exception of bit 4) to 00H, and all of the
other SFR registers except SBUF to 00H. SBUF is not reset.
W78E516B Special Function Registers (SFRs) and Reset Values
F8
FF
F0
+B
00000000
E8
CHPENR
F7
00000000
EF
E0 +ACC
00000000
D8
+P4
xxxx1111
D0 +PSW
00000000
C8 +T2CON
00000000
C0 XICON
00000000
B8
+IP
00000000
B0
+P3
00000000
A8
+IE
00000000
A0
+P2
11111111
98 +SCON
SBUF
00000000 xxxxxxxx
90
+P1
11111111
88 +TCON
TMOD
00000000 00000000
80
+P0
SP
11111111 00000111
RCAP2L
00000000
TL0
00000000
DPL
00000000
RCAP2H
00000000
TL2
00000000
SFRAL
00000000
TL1
00000000
DPH
00000000
TH0
00000000
Notes:
1.The SFRs marked with a plus sign(+) are both byte- and bit-addressable.
2. The text of SFR with bold type characters are extension function registers.
TH2
00000000
SFRAH
00000000
TH1
00000000
SFRFD
00000000
E7
DF
D7
CF
SFRCN
C7
00000000
CHPCON BF
0xx00000
B7
AF
A7
9F
97
8F
PCON
87
00110000
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