ST7FLITE09Y0B6 FARNELL, ST7FLITE09Y0B6 Datasheet - Page 27

• Manufacturer Part Number: ST7FLITE09Y0B6
• Description: IC, 8BIT MCU, ST7, 16MHZ, DIP-16
• Manufacturer: FARNELL

Specifications of ST7FLITE09Y0B6

• Controller Family/series: ST7
• No. Of I/o's: 13
• Eeprom Memory Size: 128Byte
• Ram Memory Size: 128Byte
• Cpu Speed: 16MHz
• No. Of Timers: 2
• Core Size: 8 Bit
• Program Memory Size: 1.5 Kb
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.4 RESET SEQUENCE MANAGER (RSM)
7.4.1 Introduction
The reset sequence manager includes three RE-
SET sources as shown in
■
■
■
Note: A reset can also be triggered following the
detection of an illegal opcode or prebyte code. Re-
fer to
These sources act on the RESET pin and it is al-
ways kept low during the delay phase.
The RESET service routine vector is fixed at ad-
dresses FFFEh-FFFFh in the ST7 memory map.
The basic RESET sequence consists of 3 phases
as shown in
■
■
■
Figure 16.Reset Block Diagram
External RESET source pulse
Internal LVD RESET (Low Voltage Detection)
Internal WATCHDOG RESET
Active Phase depending on the RESET source
256 CPU clock cycle delay
RESET vector fetch
Note 1: See “Illegal Opcode Reset” on page 78. for more details on illegal opcode reset conditions.
RESET
section 11.2.1 on page 53
Figure
15:
V
Figure
DD
R
ON
for further details.
16:
FILTER
GENERATOR
PULSE
The 256 CPU clock cycle delay allows the oscilla-
tor to stabilise and ensures that recovery has tak-
en place from the Reset state.
The RESET vector fetch phase duration is 2 clock
cycles.
If the PLL is enabled by option byte, it outputs the
clock after an additional delay of t
Figure
Figure 15. RESET Sequence Phases
Active Phase
13).
ST7LITE0xY0, ST7LITESxY0
WATCHDOG RESET
ILLEGAL OPCODE RESET
LVD RESET
256 CLOCK CYCLES
INTERNAL RESET
RESET
INTERNAL
RESET
STARTUP
VECTOR
FETCH
1)
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