MC68HC705J1ACDW Freescale Semiconductor, MC68HC705J1ACDW Datasheet - Page 49

IC MCU 4MHZ 1.2K OTP 20-SOIC

MC68HC705J1ACDW

Manufacturer Part Number
MC68HC705J1ACDW
Description
IC MCU 4MHZ 1.2K OTP 20-SOIC
Manufacturer
Freescale Semiconductor
Series
HC05r
Datasheet

Specifications of MC68HC705J1ACDW

Core Processor
HC05
Core Size
8-Bit
Speed
4MHz
Peripherals
POR, WDT
Number Of I /o
14
Program Memory Size
1.2KB (1.2K x 8)
Program Memory Type
OTP
Ram Size
64 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
20-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Connectivity
-

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3.5.3 Stack Pointer
MC68HC705J1A — Rev. 4.0
Reset:
Read:
Write:
The stack pointer (SP) is a 16-bit register that contains the address of
the next location on the stack. During a reset or after the reset stack
pointer instruction (RSP), the stack pointer is preset to $00FF. The
address in the stack pointer decrements after a byte is stacked and
increments before a byte is unstacked.
The 10 most significant bits of the stack pointer are permanently fixed at
0000000011, so the stack pointer produces addresses from $00C0 to
$00FF. If subroutines and interrupts use more than 64 stack locations,
the stack pointer wraps around to address $00FF and begins writing
over the previously stored data. A subroutine uses two stack locations;
an interrupt uses five locations.
Freescale Semiconductor, Inc.
For More Information On This Product,
Bit
15
0
0
= Unimplemented
14
0
0
Central Processor Unit (CPU)
Go to: www.freescale.com
13
0
0
12
0
0
Figure 3-4. Stack Pointer (SP)
11
0
0
10
0
0
9
0
0
8
0
0
7
1
1
6
1
1
Central Processor Unit (CPU)
5
1
4
1
3
1
CPU Registers
Technical Data
2
1
1
1
Bit
0
1

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