MC68HRC98JK3ECDW Freescale Semiconductor, MC68HRC98JK3ECDW Datasheet - Page 27

• Manufacturer Part Number: MC68HRC98JK3ECDW
• Description: IC MCU 4K FLASH 8MHZ 20-SOIC
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HRC98JK3ECDW

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Peripherals: LED, LVD, POR, PWM
• Number Of I /o: 15
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 12x8b
• Oscillator Type: External
• 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: -
• Connectivity: -

2.4 Random-Access Memory (RAM)
Addresses $0080 through $00FF are RAM locations. The location of the stack RAM is programmable.
The 16-bit stack pointer allows the stack to be anywhere in the 64-Kbyte memory space.
Within page zero are 128 bytes of RAM. Because the location of the stack RAM is programmable, all page
zero RAM locations can be used for I/O control and user data or code. When the stack pointer is moved
from its reset location at $00FF, direct addressing mode instructions can access efficiently all page zero
RAM locations. Page zero RAM, therefore, provides ideal locations for frequently accessed global
variables.
Before processing an interrupt, the CPU uses five bytes of the stack to save the contents of the CPU
registers.
Freescale Semiconductor
For correct operation, the stack pointer must point only to RAM locations.
Vector Priority
Highest
Lowest
For M6805 compatibility, the H register is not stacked.
INT Flag
MC68HC908JL3E Family Data Sheet, Rev. 4
IF15
IF14
IF13
IF6
IF5
IF4
IF3
IF2
IF1
—
—
—
↓
Table 2-1. Vector Addresses
Address
$FFDD
$FFD0
$FFDE
$FFDF
$FFFB
$FFFC
$FFFD
$FFFE
$FFE0
$FFE1
$FFF2
$FFF3
$FFF4
$FFF5
$FFF6
$FFF7
$FFFA
$FFFF
—
—
↓
NOTE
NOTE
Not Used
ADC Conversion Complete Vector (High)
ADC Conversion Complete Vector (Low)
Keyboard Vector (High)
Keyboard Vector (Low)
Not Used
TIM Overflow Vector (High)
TIM Overflow Vector (Low)
TIM Channel 1 Vector (High)
TIM Channel 1 Vector (Low)
TIM Channel 0 Vector (High)
TIM Channel 0 Vector (Low)
Not Used
IRQ Vector (High)
IRQ Vector (Low)
SWI Vector (High)
SWI Vector (Low)
Reset Vector (High)
Reset Vector (Low)
Vector
Random-Access Memory (RAM)
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