MC68HC705B16CFN Freescale Semiconductor, MC68HC705B16CFN Datasheet - Page 37

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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
2.4.3
SLOW mode
The SLOW mode function is controlled by the SM bit in the miscellaneous register at location
$000C. It allows the user to insert, under software control, an extra divide-by-16 between the
oscillator and the internal clock driver (see
internal operations and thus reduces power consumption. The SLOW mode function should not
be enabled while using the A/D converter or while erasing/programming the EEPROM unless the
internal A/D RC oscillator is turned on.
OSC2
OSC1
pin
pin
Oscillator
SM–bit
(bit 1, $000C)
Figure 2-4 Slow mode divider block diagram
2.4.3.1
Miscellaneous register
Address
Miscellaneous
$000C
SM — Slow mode
1 (set)
The system runs at a bus speed 16 times lower than normal
(f
/32). SLOW mode affects all sections of the device, including
OSC
SCI, A/D and timer.
0 (clear) –
The system runs at normal bus speed (f
The SM bit is cleared by external or power-on reset. The SM bit is automatically cleared when
entering STOP mode.
Note:
The bits shown shaded in the above representation are explained individually in the
relevant sections of this manual. The complete register plus an explanation of each bit
can be found in
Section
MC68HC05B6
MODES OF OPERATION AND PIN DESCRIPTIONS
Rev. 4.1
Figure
2-4). This feature permits a slow down of all the
f
f
/2
OSC
OSC
÷
2
Control logic
bit 7
bit 6
bit 5
bit 4
bit 3
POR
INTP
INTN
INTE
SFA
/2).
OSC
3.8.
÷
16
f
/32
OSC
Main internal clock
State
bit 2
bit 1
bit 0
on reset
SFB
SM
WDOG ?001 000?
Freescale
2-9
2

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