Information

PIC16C773

1999 Microchip Technology Inc. DS80011C-page 3
3. Module: TMR1
When operating in external clock mode (TMR1CS is
set), reading either of the timer 1 registers (TMR1H
or TMR1L) may cause the timer not to increment as
expected. This occurs for both synchronous and
asynchronous inputs.
The scenarios which display this are:
• When a read operation of the TMR1H register
occurs, the TMR1L register may not increment.
• When a read operation of the TMR1L register
occurs, the TMR1H register may not increment.
This improper operation is only an issue when
the TMR1L register increments from FFh to 00h
(FFh → 00H) during the read of the TMR1L reg-
ister.
Work Around
Do not read either the TMR1H or the TMR1L regis-
ters when operating in external clock mode
(TMR1CS is set). If the application needs to read the
16-bit counter, evaluate if this function can be moved
to the TMR0 or one of the other timer resources on
the device.
4. Module: MSSP- SPI™ Mode
The SDI pin cannot be used as a general purpose
output by clearing the TRIS bit when the MSSP mod-
ule is in SPI mode.
Work Around
None for current silicon revision.
5. Module: V
REF
a. The operating voltage range for VRL is VDD ≥
3.0V. (See parameter D400)
Work Around
None.
b. The maximum output voltage for VRL is 2.25V.
The minimum output voltage for VRL is 1.8V.
The maximum output voltage for VRH is 4.5V.
The minimum output voltage for VRH is 3.7V.
(See parameter D400)
Work Around
None.
c. The VRH and VRL outputs may have an output
voltage fluctuation that is typically 50mV p-p.
Work Around
Connecting a 1µF capacitor to each voltage refer-
ence pin that is used will reduce the fluctuations, if
present.
6. Module: 12-bit A/D Converter
The maximum integral error specification for the A/D
converter (parameter A03) is +/-3 LSb.
The maximum offset error specification for the A/D
converter (parameter A06) is +/-5 LSb.
The maximum integral error specification (parameter
A03) may be exceeded when either of the V
REF mod-
ule outputs is used as a reference for the A/D con-
verter.
The operating voltage range for the A/D converter is
3.5V ≤ V
DD ≤ 5.5V.
Work Around
None.
7. Module: PORTD, PORTE
The internal operation of the PIC16C773, Rev. A
device is equivalent to a PIC16C774 device. That is,
these devices include PORTD, PORTE and the Par-
allel Slave Port module.
Work Around
The application source code should set the TRISD
and TRISE registers to 00h.