參數(shù)資料
型號: TS87C54X2
廠商: Atmel Corp.
英文描述: 8-bit CMOS Microcontroller 16/32 Kbytes ROM/OTP
中文描述: 8位CMOS微控制器16/32字節(jié)ROM /雙層
文件頁數(shù): 6/58頁
文件大?。?/td> 1039K
代理商: TS87C54X2
6
Rev. C - 15 January, 2001
TS80C54X2/C58X2
TS87C54X2/C58X2
MNEMONIC
PIN NUMBER
33
TYPE
O (I)
NAME AND FUNCTION
ALE/PROG
30
27
Address Latch Enable/Program Pulse:
Output pulse for latching the low byte
of the address during an access to external memory. In normal operation, ALE
is emitted at a constant rate of 1/6 (1/3 in X2 mode) the oscillator frequency,
and can be used for external timing or clocking. Note that one ALE pulse is
skipped during each access to external data memory. This pin is also the program
pulse input (PROG) during EPROM programming. ALE can be disabled by
setting SFR’s AUXR.0 bit. With this bit set, ALE will be inactive during internal
fetches.
Program Store ENable:
The read strobe to external program memory. When
executing code from the external program memory, PSEN is activated twice each
machine cycle, except that two PSEN activations are skipped during each access
to external data memory. PSEN is not activated during fetches from internal
program memory.
External Access Enable/Programming Supply Voltage:
EA must be externally
held low to enable the device to fetch code from external program memory
locations 0000H and 3FFFH (54X2) or 7FFFH (58X2). If EA is held high, the
device executes from internal program memory unless the program counter
contains an address greater than 3FFFH (54X2) or 7FFFH (58X2). This pin also
receives the 12.75V programming supply voltage (V
PP
) during EPROM
programming. If security level 1 is programmed, EA will be internally latched
on Reset.
Crystal 1:
Input to the inverting oscillator amplifier and input to the internal
clock generator circuits.
Crystal 2:
Output from the inverting oscillator amplifier
PSEN
29
32
26
O
EA/V
PP
31
35
29
I
XTAL1
19
21
15
I
XTAL2
18
20
14
O
Table 3. Pin Description for 40/44 pin packages
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