p89c668hbbd NXP Semiconductors, p89c668hbbd Datasheet - Page 45

• 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
Data
Shift
TxD
TI
Stop Bit Gen.
RxD
Shift
Bit Detector
Sample Times
RI
Clock
Clock
RX
TX
Mode 2
2
Write to SBUF
Phase 2 Clock
(1/2 f
OSC
SMOD = 1
SMOD = 0
(SMOD is
PCON.7)
16 Reset
Start Bit
)
Send
RxD
Start
Bit
S1P1
SBUF
Write
D0
D0
to
Transition
Detector
1-to-0
Sample
D1
D1
Interrupt
Serial
16
Port
D2
D2
D
CL
TB8
Figure 30. Serial Port Mode 2
S
Bit Detector
Q
TX Clock
Start
Read
SBUF
Start
D3
D3
16
Stop Bit
RX Clock
Load
SBUF
Gen.
Zero Detector
D4
45
D4
TX Control
RX Control
80C51 Internal Bus
80C51 Internal Bus
SBUF
Input Shift Register
T1
R1
D5
D5
SBUF
Shift
(9 Bits)
P89C660/P89C662/P89C664/
1FFH
D6
D6
Load
SBUF
Data
Send
Shift
Shift
D7
D7
TB8
RB8
Stop Bit
Stop Bit
P89C668
Product data
TxD
Transmit
Receive
SU00541