AT90S1200-4YI Atmel, AT90S1200-4YI Datasheet - Page 38

• Manufacturer Part Number: AT90S1200-4YI
• Description: IC MCU 1K FLSH 4MHZ LV IT 20SSOP
• Manufacturer: Atmel
• Series: AVR® 90Sr

Specifications of AT90S1200-4YI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: SPI
• Peripherals: POR, WDT
• Number Of I /o: 15
• Program Memory Size: 1KB (512 x 16)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Ram Size: -
• Data Converters: -

Parallel Programming
Signal Names
38
AT90S1200
the self-timed write instruction in the Serial Programming mode. During programming,
the supply voltage must be in accordance with Table 13.
Table 13. Supply Voltage during Programming
This section describes how to parallel program and verify Flash program memory,
EEPROM data memory, Lock bits and Fuse bits in the AT90S1200.
Figure 30. Parallel Programming
In this section, some pins of the AT90S1200 are referenced by signal names describing
their function during parallel programming rather than their pin names, see Figure 30
and Table 14. Pins not described in Table 14 are referenced by pin names.
The XA1/XA0 pins determines the action executed when the XTAL1 pin is given a posi-
tive pulse. The coding is shown in Table 15.
When pulsing WR or OE, the command loaded determines the action executed. The
command is a byte where the different bits are assigned functions as shown in Table 16.
Table 14. Pin Name Mapping
Part
AT90S1200
Programming Mode
Signal Name in
RDY/BSY
DATA
XA0
XA1
WR
OE
BS
Serial Programming
2.7 - 6.0V
Pin Name
PB0-7
PD1
PD2
PD3
PD4
PD5
PD6
I/O
I/O
O
I
I
I
I
I
Function
0: Device is busy programming, 1: Device is ready
for new command
Output Enable (Active low)
Write Pulse (Active low)
Byte Select (“0” selects low byte, “1” selects high
byte)
XTAL Action Bit 0
XTAL Action Bit 1
Bi-directional Data Bus (Output when OE is low)
Parallel Programming
4.5 - 5.5V
0838H–AVR–03/02