ST72C334N2B6 STMicroelectronics, ST72C334N2B6 Datasheet - Page 41

• Manufacturer Part Number: ST72C334N2B6
• Description: Microcontrollers (MCU) Flash 8K SPI/SCI
• Manufacturer: STMicroelectronics

Specifications of ST72C334N2B6

• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 8 KB
• Data Ram Size: 384 B
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 44
• Number Of Timers: 16 bit
• Operating Supply Voltage: 3.2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Package / Case: SDIP-56
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / Rohs Status: No

POWER SAVING MODES (Cont’d)
5.2.4 SLOW Mode
This mode has two targets:
– To reduce power consumption by decreasing the
– To adapt the internal clock frequency (f
SLOW mode is controlled by three bits in the
MISCR1 register: the SMS bit which enables or
Figure 31. SLOW Mode: timing diagram for internal CPU clock transitions
internal clock in the device,
the available supply voltage.
f
f
CP1:0
OSC
OSC
SMS
f
CPU
/4
/8
00
NEW FREQUENCY
REQUEST
CPU
OSC/4 & OSC/8 = 0
NEW FREQUENCY
ACTIV E WHEN
) to
disables Slow mode and two CPx bits which select
the internal slow frequency (f
In this mode, the oscillator frequency can be divid-
ed by 4, 8, 16 or 32 instead of 2 in normal operat-
ing mode. The CPU and peripherals are clocked at
this lower frequency.
Note: SLOW-WAIT mode is activated when enter-
ring the WAIT mode while the device is already in
SLOW mode.
01
ST72334J/N, ST72314J/N, ST72124J
(OSC/4, OSC/8 STOPPED)
NORMAL MODE
NORMAL MODE ACTIVE
REQUEST
1
0
CPU
).
REGISTE R
MISCR1
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