XC68HC705B32CFN Freescale Semiconductor, XC68HC705B32CFN Datasheet - Page 105

• Manufacturer Part Number: XC68HC705B32CFN
• Description: IC MCU 2.1MHZ 32K OTP 52-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of XC68HC705B32CFN

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 2.1MHz
• Connectivity: SCI
• Peripherals: POR, WDT
• Number Of I /o: 32
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: OTP
• Eeprom Size: 256 x 8
• Ram Size: 528 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 52-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

9.1
The MC68HC05B6 can be reset in three ways: by the initial power-on reset function, by an active
low input to the RESET pin or by a computer operating properly (COP) watchdog reset. Any of
these resets will cause the program to go to its starting address, specified by the contents of
memory locations $1FFE and $1FFF, and cause the interrupt mask bit in the condition code
register to be set.
MC68HC05B6
Rev. 4.1
V
OSC1
Internal
processor clock
RESET
Internal
address bus
Internal
data bus
DD
t
VDDR
t
OXOV
V
Resets
DD
threshold (1-2V typical)
RESETS AND INTERRUPTS
t
PORL
1FFE
1FFE
(Internal power-on reset)
Reset sequence
Figure 9-1 Reset timing diagram
1FFE
RESETS AND INTERRUPTS
1FFE
PCH
New
t
CYC
1FFF
New
PCL
9
code
New
Op
Program
execution
begins
PC
t
RL
(or t
DOGL
1FFE
)
1FFE
(External hardware reset)
Reset sequence
1FFE
1FFE
PCH
New
New
PCL
1FFF
Freescale
code
New
Program
execution
begins
Op
PC
9-1
9