MC68HC705B16CFN Freescale Semiconductor, MC68HC705B16CFN Datasheet - Page 105

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MC68HC705B16CFN

Manufacturer Part Number
MC68HC705B16CFN
Description
IC MCU 2.1MHZ 15K OTP 52-PLCC
Manufacturer
Freescale Semiconductor
Series
HC05r
Datasheet

Specifications of MC68HC705B16CFN

Core Processor
HC05
Core Size
8-Bit
Speed
2.1MHz
Connectivity
SCI
Peripherals
POR, WDT
Number Of I /o
32
Program Memory Size
15KB (15K x 8)
Program Memory Type
OTP
Eeprom Size
256 x 8
Ram Size
352 x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x8b
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

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