P87C51FB-4B,557 NXP Semiconductors, P87C51FB-4B,557 Datasheet - Page 23

• Manufacturer Part Number: P87C51FB-4B,557
• Manufacturer: NXP Semiconductors

Philips Semiconductors
2000 Aug 07
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
BIT
IP.7
IP.6
IP.5
IP.4
IP.3
IP.2
IP.1
IP.0
BIT
IPH.7
IPH.6
IPH.5
IPH.4
IPH.3
IPH.2
IPH.1
IPH.0
IPH (B7H)
IP (0B8H)
SYMBOL
—
PPC
PT2
PS
PT1
PX1
PT0
PX0
SYMBOL
—
PPCH
PT2H
PSH
PT1H
PX1H
PT0H
PX0H
Priority Bit = 1 assigns high priority
Priority Bit = 0 assigns low priority
Priority Bit = 1 assigns higher priority
Priority Bit = 0 assigns lower priority
FUNCTION
Not implemented, reserved for future use.
PCA interrupt priority bit for FX and RX+ only, otherwise it is not implemented.
Timer 2 interrupt priority bit.
Serial Port interrupt priority bit.
Timer 1 interrupt priority bit.
External interrupt 1 priority bit.
Timer 0 interrupt priority bit.
External interrupt 0 priority bit.
FUNCTION
Not implemented, reserved for future use.
PCA interrupt priority bit high for FX and RX+ only, otherwise it is not implemented.
Timer 2 interrupt priority bit high.
Serial Port interrupt priority bit high.
Timer 1 interrupt priority bit high.
External interrupt 1 priority bit high.
Timer 0 interrupt priority bit high.
External interrupt 0 priority bit high.
—
—
7
7
PPCH
PPC
6
6
PT2H
PT2
5
5
Figure 12. IPH Registers
Figure 11. IP Registers
PSH
PS
4
4
23
PT1H
PT1
3
3
PX1H
PX1
2
2
PT0H
8XC51RA+/RB+/RC+/RD+/80C51RA+
PT0
1
1
PX0H
SU00841
PX0
0
0
SU00881
8XC51FA/FB/FC/80C51FA
Product specification
8XC54/58