p89v51rb2 NXP Semiconductors, p89v51rb2 Datasheet - Page 61

• Manufacturer Part Number: p89v51rb2
• Description: 8-bit 80c51 5 V Low Power 16/32/64 Kb Flash Microcontroller With 1 Kb Ram
• Manufacturer: NXP Semiconductors

NXP Semiconductors
P89V51RB2_RC2_RD2_4
Product data sheet
Table 58.
Table 59.
Not Bit addressable; Reset value: xxxx x0xxB
Table 60.
Device
P89V51RD2
Bit
7
6
5 to 4
3
2 to 0
Bit
Symbol
Fig 29. Oscillator characteristics (external clock drive)
Clock doubling features
FST - Flash status register (address B6) bit allocation
FST - Flash status register (address B6) bit description
Symbol
-
SB
-
EDC
-
7
-
Standard mode (X1)
Clocks per
machine cycle
12
SB
6
Rev. 04 — 1 May 2007
Description
Reserved for future use. Should be set to ‘0’ by user programs.
Security bit.
Reserved for future use. Should be set to ‘0’ by user programs.
Enable double clock.
Reserved for future use. Should be set to ‘0’ by user programs.
5
-
oscillator
external
signal
Max. external
clock frequency
(MHz)
40
n.c.
4
-
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
002aaa546
XTAL2
XTAL1
V
SS
EDC
3
Clock double mode (X2)
Clocks per
machine cycle
6
2
-
© NXP B.V. 2007. All rights reserved.
Max. external
clock frequency
(MHz)
20
1
-
61 of 80
0
-