P89LPC912FDH NXP Semiconductors, P89LPC912FDH Datasheet - Page 23

• Manufacturer Part Number: P89LPC912FDH
• Description: MCU 8BIT 80C51 1K FLASH, TSSOP14
• Manufacturer: NXP Semiconductors

Specifications of P89LPC912FDH

• Controller Family/series: (8051) 8052
• Core Size: 8bit
• No. Of I/o's: 12
• Program Memory Size: 1KB
• Ram Memory Size: 128Byte
• Cpu Speed: 18MHz
• Oscillator Type: External, Internal
• No. Of Timers: 4
• No. Of: RoHS Compliant

Table 8.
* indicates SFRs that are bit addressable.
[1]
[2]
[3]
[4]
[5]
[6]
Name
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 of them is written if BRGEN = 1, result is unpredictable.
The RSTSRC register reflects the cause of the P89LPC912 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.
P89LPC913 Special function registers
Description
Watchdog load
Watchdog feed 1
Watchdog feed 2
SFR
addr.
C1H
C2H
C3H
Bit functions and addresses
…continued
MSB
LSB
Reset value
Hex
FF
Binary
1111 1111