P89LPC915HDH NXP Semiconductors, P89LPC915HDH Datasheet - Page 22

• Manufacturer Part Number: P89LPC915HDH
• Description: MCU 8BIT 80C51 2K FLASH, TSSOP14
• Manufacturer: NXP Semiconductors

Specifications of P89LPC915HDH

• Controller Family/series: (8051) 8052
• Core Size: 8bit
• No. Of I/o's: 14
• Program Memory Size: 2KB
• Ram Memory Size: 256Byte
• Cpu Speed: 18MHz
• Oscillator Type: Internal Only
• No. Of Timers: 4
• Digital Ic: RoHS Compliant

Table 7.
* indicates SFRs that are bit addressable.
[1]
[2]
[3]
[4]
[5]
[6]
Name
TCON*
TH0
TH1
TL0
TL1
TMOD
TRIM
WDCON
WDL
WFEED1
WFEED2
All ports are in input only (high-impedance) state after power-up.
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.
The RSTSRC register reflects the cause of the P89LPC915/916/917 reset. Upon a power-up reset, all reset source flags are cleared except POF and BOF; the power-on reset
value is xx11 0000.
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.
On power-on reset, the TRIM SFR is initialized with a factory preprogrammed value. Other resets will not cause initialization of the TRIM register.
The only reset source that affects these SFRs is power-on reset.
P89LPC915 special function registers
Description
Timer 0 and 1 control
Timer 0 high
Timer 1 high
Timer 0 low
Timer 1 low
Timer 0 and 1 mode
Internal oscillator trim register
Watchdog control register
Watchdog load
Watchdog feed 1
Watchdog feed 2
Bit address
SFR
addr.
8CH
8DH
8AH
8BH
A7H
C1H
C2H
C3H
88H
89H
96H
…continued
Bit functions and addresses
T1GATE
RCCLK
PRE2
MSB
TF1
8F
T1C/T
PRE1
TR1
8E
-
TRIM.5
T1M1
PRE0
TF0
8D
TRIM.4
T1M0
TR0
8C
-
T0GATE
TRIM.3
IE1
8B
-
WDRUN
TRIM.2
T0C/T
IT1
8A
WDTOF
TRIM.1
T0M1
IE0
89
WDCLK
TRIM.0
T0M0
LSB
IT0
88
Reset value
Hex
00
00
00
00
00
00
[5] [6]
[4] [6]
FF
Binary
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
1111 1111