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P89CV51RB2FBC Datasheet(PDF) 8 Page - NXP Semiconductors |
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P89CV51RB2FBC Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 73 page P89CV51RB2_RC2_RD2_1 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 01 — 5 October 2007 8 of 73 NXP Semiconductors P89CV51RB2/RC2/RD2 80C51 with 1 kB RAM, SPI [1] ALE loading issue: When ALE pin experiences higher loading (> 30 pF) during the reset, the microcontroller may accidentally enter into modes other than normal working mode. The solution is to add a pull-up resistor from 3 k Ω to 50 kΩ between e.g., ALE pin and V DD. [2] For 6-clock mode, ALE is emitted at 1 ⁄ 3 of crystal frequency. 6. Functional description 6.1 Special function registers Remark: SFR accesses are restricted in the following ways: • Do not attempt to access any SFR locations that are undefined. • Access to defined SFR locations must be strictly for the functions of the SFRs. • SFR bits labeled ‘-’, ‘0’ or ‘1’ can only be written and read as follows: – ‘-’ Unless otherwise specified, must be written with ‘0’, but can return any value when read (even if it was written with ‘0’). It is a reserved bit and may be used in future derivatives. – ‘0’ must be written with ‘0’, and will return a ‘0’ when read. – ‘1’ must be written with ‘1’, and will return a ‘1’ when read. RST 10 4 I Reset: While the oscillator is running, a HIGH logic state on this pin for two machine cycles will reset the device. EA 35 29 I External Access Enable: EA must be connected to VSS in order to enable the device to fetch code from the external program memory. EA must be strapped to VDD for internal program execution. ALE 33 27 I/O Address Latch Enable: ALE is the output signal for latching the low byte of the address during an access to external memory. Normally the ALE[1] is emitted at a constant rate of 1 ⁄ 6 the crystal frequency [2] and can be used for external timing and clocking. One ALE pulse is skipped during each access to external data memory. However, if bit AO is set to 1, ALE is disabled. XTAL1 21 15 I Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator circuits. XTAL2 20 14 O Crystal 2: Output from the inverting oscillator amplifier. VDD 44 38 supply Power supply VSS 22 16 supply Ground Table 3. P89CV51RB2/RC2/RD2 Pin description …continued Symbol Pin Type Description PLCC44 TQFP44 |
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