P89LPC9401FBD NXP Semiconductors, P89LPC9401FBD Datasheet - Page 15

• Manufacturer Part Number: P89LPC9401FBD
• Description: IC, MCU 8BIT 80C51, LCD DRIVER, SMD
• Manufacturer: NXP Semiconductors

Specifications of P89LPC9401FBD

• Controller Family/series: (8051) 8052
• Core Size: 8bit
• No. Of I/o's: 23
• Program Memory Size: 8KB
• Ram Memory Size: 256Byte
• Cpu Speed: 18MHz
• Oscillator Type: External, Internal
• No. Of Timers: 4
• No.: RoHS Compliant

Table 4:
* indicates SFRs that are bit addressable.
[1]
[2]
[3]
[4]
[5]
[6]
Name
TAMOD
TCON*
TH0
TH1
TL0
TL1
TL2
TMOD
TRIM
WDCON
WDL
WFEED1
WFEED2
BRGR1 and BRGR0 must only be written if BRGEN in BRGCON SFR is logic 0. If any are written while BRGEN = 1, the result is unpredictable.
All ports are in input only (high-impedance) state after power-up.
The RSTSRC register reflects the cause of the P89LPC9401 reset. Upon a power-up reset, all reset source flags are cleared except POF and BOF; the power-on reset value is
xx11 0000.
The only reset source that affects these SFRs is power-on reset.
On power-on reset, the TRIM SFR is initialized with a factory preprogrammed value. Other resets will not cause initialization of the TRIM register.
After reset, the value is 1110 01x1, i.e., PRE2 to PRE0 are all logic 1, WDRUN = 1 and WDCLK = 1. WDTOF bit is logic 1 after watchdog reset and is logic 0 after power-on reset.
Other resets will not affect WDTOF.
Special function registers
Description
Timer 0 and 1 auxiliary
mode
Timer 0 and 1 control
Timer 0 high
Timer 1 high
Timer 0 low
Timer 1 low
CCU timer low
Timer 0 and 1 mode
Internal oscillator trim
register
Watchdog control register
Watchdog load
Watchdog feed 1
Watchdog feed 2
Bit address
…continued
SFR
addr.
CCH
8FH
8CH
8DH
8AH
8BH
A7H
C1H
C2H
C3H
88H
89H
96H
Bit functions and addresses
T1GATE
PRE2
MSB
TF1
8F
-
-
ENCLK
T1C/T
PRE1
TR1
8E
-
TRIM.5
T1M1
PRE0
TF0
8D
-
TRIM.4
T1M2
T1M0
TR0
8C
-
T0GATE
TRIM.3
IE1
8B
-
-
WDRUN
TRIM.2
T0C/T
IT1
8A
-
WDTOF
TRIM.1
T0M1
IE0
89
-
WDCLK
TRIM.0
T0M2
T0M0
LSB
IT0
88
Reset value
Hex
00
00
00
00
00
00
00
00
FF
[5] [4]
[6] [4]
Binary
xxx0 xxx0
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
1111 1111