C8051T326-GMR Silicon Labs, C8051T326-GMR Datasheet - Page 130
C8051T326-GMR
Manufacturer Part Number
C8051T326-GMR
Description
8-bit Microcontrollers - MCU USB-OTP-16K-QFN28
Manufacturer
Silicon Labs
Datasheet
1.C8051T322-GQR.pdf
(292 pages)
Specifications of C8051T326-GMR
Rohs
yes
Core
8051
Processor Series
C8051
Data Bus Width
8 bit
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C8051T620/621/320/321/322/323
13 pF
XTAL1
10 M
32 kHz
XTAL2
13 pF
Figure 21.2. External Crystal Example
Important Note on External Crystals: Crystal oscillator circuits are quite sensitive to PCB layout. The
crystal should be placed as close as possible to the XTAL pins on the device. The traces should be as
short as possible and shielded with ground plane from any other traces which could introduce noise or
interference.
When using an external crystal, the external oscillator drive circuit must be configured by software for Crys-
tal Oscillator Mode or Crystal Oscillator Mode with divide by 2 stage. The divide by 2 stage ensures that the
clock derived from the external oscillator has a duty cycle of 50%. The External Oscillator Frequency Con-
trol value (XFCN) must also be specified based on the crystal frequency (see SFR Definition 21.6).
When the crystal oscillator is first enabled, the external oscillator valid detector allows software to deter-
mine when the external system clock is valid and running. Switching to the external oscillator before the
crystal oscillator has stabilized can result in unpredictable behavior. The recommended procedure for start-
ing the crystal is:
1. Configure XTAL1 and XTAL2 for analog I/O.
2. Disable the XTAL1 and XTAL2 digital output drivers by writing 1s to the appropriate bits in the Port
Latch register.
3. Configure and enable the external oscillator.
4. Wait at least 1 ms.
5. Poll for XTLVLD => '1'.
6. Switch the system clock to the external oscillator.
130
Rev. 1.1
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