P89C54X2BA NXP Semiconductors, P89C54X2BA Datasheet - Page 30

• Manufacturer Part Number: P89C54X2BA
• Manufacturer: NXP Semiconductors

Specifications of P89C54X2BA

• Cpu Family: 89C
• Device Core: 80C51
• Device Core Size: 8b
• Frequency (max): 20MHz
• Interface Type: UART
• Program Memory Type: Flash
• Program Memory Size: 16KB
• Total Internal Ram Size: 256Byte
• # I/os (max): 32
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• Instruction Set Architecture: CISC
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 44
• Package Type: PLCC
• Lead Free Status / Rohs Status: Compliant

Philips Semiconductors
2002 Jun 06
80C51 8-bit Flash microcontroller family
4K/8K/16K/32K Flash
Figure 20. UART Multiprocessor Communication, Automatic Address Recognition
START
BIT
IN UART MODE 2 OR MODE 3 AND SM2 = 1:
– WHEN OWN ADDRESS RECEIVED, CLEAR SM2 TO RECEIVE DATA BYTES
– WHEN ALL DATA BYTES HAVE BEEN RECEIVED: SET SM2 TO WAIT FOR NEXT ADDRESS.
D0
SM0 / FE
INTERRUPT IF REN=1, RB8=1 AND “RECEIVED ADDRESS” = “PROGRAMMED ADDRESS”
RECEIVED ADDRESS D0 TO D7
SMOD1
PROGRAMMED ADDRESS
D0
0 : SCON.7 = SM0
1 : SCON.7 = FE
D1
SMOD0
SM1
D1
Figure 19. UART Framing Error Detection
D2
SM2
SM0
D2
–
1
1
D3
REN
SM1
D3
POF
DATA BYTE
1
0
SET FE BIT IF STOP BIT IS 0 (FRAMING ERROR)
SM0 TO UART MODE CONTROL
D4
30
TB8
D4
SM2
GF1
COMPARATOR
D5
1
D5
RB8
GF0
REN
1
D6
D6
P89C51X2/52X2/54X2/58X2
PD
TB8
TI
D7
X
D7
RB8
IDL
D8
RI
MODE 2, 3
ONLY IN
D8
SCON
(98H)
PCON
(87H)
TI
STOP
BIT
SU01191
RI
Preliminary data
SU00045
SCON
(98H)