MC68HC705B16CFN

Manufacturer Part NumberMC68HC705B16CFN
DescriptionIC MCU 2.1MHZ 15K OTP 52-PLCC
ManufacturerFreescale Semiconductor
SeriesHC05
MC68HC705B16CFN datasheet
 


Specifications of MC68HC705B16CFN

Core ProcessorHC05Core Size8-Bit
Speed2.1MHzConnectivitySCI
PeripheralsPOR, WDTNumber Of I /o32
Program Memory Size15KB (15K x 8)Program Memory TypeOTP
Eeprom Size256 x 8Ram Size352 x 8
Voltage - Supply (vcc/vdd)4.5 V ~ 5.5 VData ConvertersA/D 8x8b
Oscillator TypeInternalOperating Temperature-40°C ~ 85°C
Package / Case52-PLCCLead Free Status / RoHS StatusContains lead / RoHS non-compliant
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A.2
Self-check mode
The self-check function available on the MC68HC05B4 provides an internal capability to
determine if the device is functional. Self-check is performed using the circuit shown in
Port C pins PC0–PC3 are monitored for the self-check results (light emitting diodes are shown but
other devices could be used), and are interpreted as described in
is entered by applying 2 x V
dc (via a 4.7kΩ resistor) to the IRQ pin and 5V dc input (via a 4.7kΩ
DD
resistor) to the TCAP1 pin and then depressing the reset switch to execute a reset. After reset, the
following tests are performed automatically and once completed they continually repeat. A good
device will exhibit flashing LEDs; a bad device will be indicated by the LEDs holding at one value.
Note:
Self-check code can be obtained from your local Freescale representative.
I/0
Functionally exercises ports A, B, C and D
RAM
Counter test for each RAM byte
ROM
Exclusive OR with odd ones parity result
Timer
Tracks counter registers and checks ICF1, ICF2, OCF1, OCF2 and TOF
flags
SCI
Transmission test; check for RDRF, TDRE, TC and FE flags
A/D
Check A/D functionality on internal channels: VRL, VRH and (VRL +
VRH)/2
PLM
Checks the PLM basic functionality
Interrupts —
Tests external timer and SCI interrupts
Watchdog—
Tests the watchdog
Caution: This document includes descriptions of the various self-check and bootstrap
mechanisms that are currently implemented as firmware in the non-user ROM areas of
the MC68HC05B6 and related devices.
As these firmware routines are intended primarily to help Freescale’s engineers test the
devices, they may be changed or removed at any time.
For this reason, Freescale recommends the self-check and bootstrap routines are not
called from the user software. Customers who do call these routines from the user
software do so at their own risk.
MC68HC05B6
Rev. 4.1
Table
A-3. The self-check mode
MC68HC05B4
Figure
A-3.
14
Freescale
A-5