MC68HC705B16CFN Freescale Semiconductor, MC68HC705B16CFN Datasheet - Page 193
Manufacturer Part Number
IC MCU 2.1MHZ 15K OTP 52-PLCC
Specifications of MC68HC705B16CFN
Number Of I /o
Program Memory Size
15KB (15K x 8)
Program Memory Type
256 x 8
352 x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
-40°C ~ 85°C
Package / Case
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
When using an external clock the OSC1 and OSC2 pins should be driven in antiphase (see
external clock input. The equivalent specification of the external clock source should be used in
lieu of t
The MC68HC705B16 memory map is given in
of EPROM (including 14 bytes for User vectors) and 256 bytes of EEPROM.
The EPROM array is supplied by the VPP6 pin in both read and program modes. Typically the
user’s software would be loaded into a programming board where V
bootstrap loader routines. It would then be placed in an application where no programming occurs.
In this case the VPP6 pin should be hardwired to V
Warning: A minimum V
The execution of a program in the EPROM address range or a load from the EPROM are both
read operations. The E6LAT bit in the EPROM/EEPROM control register should be cleared to ‘0’
which automatically resets the E6PGM bit. In this way the EPROM is read like a normal ROM.
Reading the EPROM with the E6LAT bit set will give data that does not correspond to the actual
memory content. As interrupt vectors are in EPROM, they will not be loaded when E6LAT is set.
Similarly, the bootstrap ROM routines cannot be executed when E6LAT is set. In read mode, the
VPP6 pin must be at the V
set to the read mode.
Typically the EPROM will be programmed by the bootstrap routines resident in the on-chip ROM.
However, the user program can be used to program some EPROM locations if the proper
procedure is followed. In particular, the programming sequence must be running in RAM, as the
D-2). The t
power-on. Failure to do so could result in permanent damage to the device. Unless
otherwise stated, EPROM programming is guaranteed at ambient (25°C) temperature
An erased byte reads as $00.
EPROM read operation
EPROM program operation
voltage must be applied to the VPP6 pin at all times, including
level. When entering the STOP mode, the EPROM is automatically
E-2. The device has a total of 15168 bytes
E.8) do not apply when using an
is controlled by one of the