SST89E554RC-40-C-PI Microchip Technology, SST89E554RC-40-C-PI Datasheet - Page 12

• Manufacturer Part Number: SST89E554RC-40-C-PI
• Description: 8-bit Microcontrollers - MCU 32KB+8KB 40ns
• Manufacturer: Microchip Technology

Specifications of SST89E554RC-40-C-PI

• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 40 MHz
• Program Memory Size: 32 KB
• Data Ram Size: 1 KB
• On-chip Adc: No
• Operating Supply Voltage: 4.5 V to 5.5 V
• Package / Case: PDIP-40
• Mounting Style: Through Hole
• Data Rom Size: 128 B
• Interface Type: SPI, UART
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Number Of Programmable I/os: 32
• Number Of Timers: 16 bit
• On-chip Dac: No
• Processor Series: FlashFlex
• Program Memory Type: Flash
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 4.5 V

EOL Data Sheet
TABLE
©2007 Silicon Storage Technology, Inc.
ALE/PROG#
Symbol
1. I = Input; O = Output
2. It is not necessary to receive a 12V programming supply voltage during flash programming.
3.ALE loading issue: When ALE pin experiences higher loading (>30pf) during the reset, the MCU may accidentally enter into modes
4. For 6 clock mode, ALE is emitted at 1/3 of crystal frequency.
PSEN#
XTAL1
XTAL2
P3[2]
P3[3]
P3[4]
P3[5]
P3[6]
P3[7]
RST
EA#
V
V
NC
other than normal working mode. The solution is to add a pull-up resistor of 3-50 KΩ to V
DD
SS
2-1: P
IN
Type
D
I/O
I/O
I/O
O
O
O
I
I
I
I
I
I
I
I
I
ESCRIPTIONS
1
Name and Functions
INT0#: External Interrupt 0 Input
INT1#: External Interrupt 1 Input
T0: External count input to Timer/Counter 0
T1: External count input to Timer/Counter 1
WR#: External Data Memory Write strobe
RD#: External Data Memory Read strobe
Program Store Enable: PSEN# is the Read strobe to external program. When the device is
executing from internal program memory, PSEN# is inactive (High). When the device is exe-
cuting code from external program memory, PSEN# is activated twice each machine cycle,
except that two PSEN# activations are skipped during each access to external data memory.
A forced high-to-low input transition on the PSEN# pin while the RST input is continually held
high for more than 10 machine cycles will cause the device to enter external host mode pro-
gramming.
Reset: While the oscillator is running, a “high” logic state on this pin for two machine cycles
will reset the device. If the PSEN# pin is driven by a high-to-low input transition while the RST
input pin is held “high,” the device will enter the external host mode, otherwise the device will
enter the normal operation mode.
External Access Enable: EA# must be connected to V
fetch code from the external program memory. EA# must be strapped to V
gram execution. However, Security lock level 4 will disable EA#, and program execution is
only possible from internal program memory. The EA# pin can tolerate a high voltage
(See Section 13.0, “Electrical Specification”)
Address Latch Enable: ALE is the output signal for latching the low byte of the address dur-
ing an access to external memory. This pin is also the programming pulse input (PROG#) for
flash programming. Normally the ALE
quency
each access to external data memory. However, if AO is set to 1, ALE is disabled.
(See “Auxiliary Register (AUXR)” in Section 3.6, “Special Function Registers”)
No Connect
Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator
circuits.
Crystal 2: Output from the inverting oscillator amplifier.
Power Supply
Ground
(C
4
ONTINUED
and can be used for external timing and clocking. One ALE pulse is skipped during
) (2
OF
2)
12
3
is emitted at a constant rate of 1/6 the crystal fre-
SST89E564RD / SST89V564RD
SST89E554RC / SST89V554RC
DD
, e.g. for ALE pin.
SS
in order to enable the device to
FlashFlex MCU
DD
S71207-08-EOL
for internal pro-
2
T2-1.4 1207
of 12V.
1/07