ST7FLITEUS5B6 STMicroelectronics, ST7FLITEUS5B6 Datasheet - Page 26

• Manufacturer Part Number: ST7FLITEUS5B6
• Description: MCU 8BIT 1KB FLASH 128KB 8-DIP
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST7FLITEUS5B6

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 8MHz
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 5
• Program Memory Size: 1KB (1K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Controller Family/series: ST7
• No. Of I/o's: 5
• Ram Memory Size: 128Byte
• Cpu Speed: 8MHz
• No. Of Timers: 2
• Rohs Compliant: Yes
• For Use With: 497-6403 - BOARD EVAL 8BIT MICRO + TDE1708497-6407 - BOARD EVAL FOR VACUUM CLEANER497-5861 - EVAL BRD POWER MOSFET/8PIN MCU497-5858 - EVAL BOARD PLAYBACK ST7FLITE497-5515 - EVAL BOARD PHASE CTRL DIMMER497-5049 - KIT STARTER RAISONANCE ST7FLITE497-5046 - KIT TOOL FOR ST7/UPSD/STR7 MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Connectivity: -
• Other names: 497-5636-5

Central processing unit
5.3.5
Note:
26/136
Stack Pointer (SP)
Reset value: 00 FFh
The Stack Pointer is a 16-bit register which is always pointing to the next free location in the
stack. It is then decremented after data has been pushed onto the stack and incremented
before data is popped from the stack (see
Since the stack is 64 bytes deep, the 10 most significant bits are forced by hardware.
Following an MCU Reset, or after a Reset Stack Pointer instruction (RSP), the Stack Pointer
contains its reset value (the SP5 to SP0 bits are set) which is the stack higher address.
The least significant byte of the Stack Pointer (called S) can be directly accessed by a LD
instruction.
When the lower limit is exceeded, the Stack Pointer wraps around to the stack upper limit,
without indicating the stack overflow. The previously stored information is then overwritten
and therefore lost. The stack also wraps in case of an underflow.
The stack is used to save the return address during a subroutine call and the CPU context
during an interrupt. The user may also directly manipulate the stack by means of the PUSH
and POP instructions. In the case of an interrupt, the PCL is stored at the first location
pointed to by the SP. Then the other registers are stored in the next locations as shown in
Figure
●
●
A subroutine call is located at two locations and an interrupt five locations in the stack area.
When an interrupt is received, the SP is decremented and the context is pushed on the
stack.
On return from interrupt, the SP is incremented and the context is popped from the
stack.
15
0
7
1
8.
0
1
SP5
0
SP4
0
Read/write
Read/write
Figure
8).
SP3
0
SP2
0
ST7LITEUS2, ST7LITEUS5
SP1
0
SP0
8
0
0