p89c668hbbd NXP Semiconductors, p89c668hbbd Datasheet - Page 43

• Manufacturer Part Number: p89c668hbbd
• Description: 80c51 8-bit Flash Microcontroller Family
• Manufacturer: NXP Semiconductors

Philips Semiconductors
2002 Oct 28
80C51 8-bit Flash microcontroller family
16KB/32KB/64KB ISP/IAP Flash with 512B/1KB/2KB/8KB RAM
TxD (Shift Clock)
TI
RI
Receive
Shift
RxD (Data In)
TxD (Shift Clock)
Send
Shift
RxD (Data Out)
S4 . .
ALE
S1
Write to SBUF
Write to SCON (Clear RI)
. . . .
S6P2
SBUF
Write
to
S6
S6
REN
RI
S1
. . . .
D0
S3P1
S6
D0
S1
Interrupt
S5P2
Serial
Port
. . . .
D1
D
S6P1
CL
S
S6
D1
Q
S1
LSB
. . . .
TX Clock
Start
Read
SBUF
Start
RX Clock
D2
S6
LSB
Load
SBUF
Figure 28. Serial Port Mode 0
D2
Zero Detector
S1
TX Control
RX Control
1
. . . .
D3
80C51 Internal Bus
80C51 Internal Bus
1
T1
R1
Input Shift Register
SBUF
1
S6
D3
1
SBUF
S1
43
1
. . . .
D4
1
Receive
1
S6
Shift
Send
Shift
D4
0
S1
Shift
MSB
. . . .
D5
MSB
P89C660/P89C662/P89C664/
S6
D5
S1
. . . .
D6
Shift
Clock
S6
D6
S1
. . . .
D7
Function
P3.0 Alt
Input
RxD
S6
D7
S1
Function
P3.0 Alt
Output
. . . .
RxD
S6
P89C668
Function
P3.1 Alt
Output
S1
TxD
Product data
Transmit
Receive
SU00539