W78E516B-24 Winbond, W78E516B-24 Datasheet - Page 6

• Manufacturer Part Number: W78E516B-24
• Description: 8-BIT MICROCONTROLLER
• Manufacturer: Winbond

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
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.
D8
D0
C8
C0
F8
F0
E8
E0
B8
B0
A8
A0
98
90
88
80
00000000
00000000
xxxx1111
00000000
00000000
00000000
00000000
00000000
00000000
11111111
00000000
11111111
00000000
11111111
+T2CON
+SCON
+TCON
XICON
+PSW
+ACC
+P3
+P2
+P1
+P0
+P4
+IP
+IE
+B
00000000
00000111
xxxxxxxx
TMOD
SBUF
SP
00000000
00000000
00000000
RCAP2L
DPL
TL0
00000000
00000000
00000000
RCAP2H
DPH
TL1
- 6 -
00000000
00000000
00000000
SFRAL
TH0
TL2
00000000
00000000
00000000
SFRAH
TH2
TH1
00000000
00000000
CHPENR
SFRFD
W78E516B
00000000
CHPCON
0xx00000
00110000
SFRCN
PCON
EF
DF
D7
CF
C7
BF
AF
FF
F7
E7
B7
A7
9F
97
8F
87