Microchip ATTINY87 Handleiding


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ATtiny87/167 Automotive
Automotive Silicon Errata and Data Sheet Clarifications
Introduction
The ATtiny87/167 Automotive devices you have received conform functionally to the current device data sheet
(www.microchip.com/mymicrochip/filehandler.aspx?ddocname=en590544), except for the anomalies described in this
document. The errata described in this document will likely be addressed in future revisions of the ATtiny87/167
Automotive devices.
Note:ā€€
ā€¢ This document summarizes all the silicon errata issues from all revisions of silicon, previous and current.
Ā© 2021 Microchip Technology Inc.
and its subsidiaries
Errata DS80000970A-page 1
1. Silicon Issue Summary
Legend
-Erratum is not applicable.
XErratum is applicable.
Errata Overview
Peripheral Short Description
Valid for Silicon Revision
Rev. A Rev. B Rev. C
Date Code >
1207
Date Code >
1208
System Clock and
Clock Options
2.2.1 Gain Control of the Crystal
Oscillator X X X
2.2.2 ā€œDisable Clock Sourceā€
Command Remains Enabled X X X
LIN-UART
2.3.1 CRC Calculation of
Diagnostic Frames in LIN 2.x X - -
2.3.2 LIN Break Delimiter X X -
ADC
2.4.1 Comparison Between ADC
Inputs and Voltage References X - -
2.4.2 Register Bits of DIDR1 X - -
ATtiny87/167 Automotive
Silicon Issue Summary
Ā© 2021 Microchip Technology Inc.
and its subsidiaries
Errata DS80000970A-page 2
2. Silicon Errata Issues
2.1 Errata Details
-Erratum is not applicable.
XErratum is applicable.
2.2 System Clock and Clock Options
2.2.1 Gain Control of the Crystal Oscillator
The crystal oscillator (0.4 ā†’ 16 MHz) doesnā€™t latch its gain control (CKSEL/CSEL[2..0] bits):
1. The ā€˜recover system clock sourceā€™ command doesnā€™t return CSEL[2..0] bits.
2. The gain control can be modified on the fly if CLKSELR changes.
Work Around
1. No work around.
2. As soon as possible, after any CLKSELR modification, re-write the appropriate crystal oscillator setting
(CSEL[3]=1 and CSEL[2..0] / CSUT[1..0] bits) in CLKSELR.
Code example:
; Select crystal oscillator (16MHz crystal, fast rising power)
ldi temp1,((0x0F<<CSEL0)|(0x02<<CSUT0))
sts CLKSELR, temp1
; Enable clock source (crystal oscillator)
ldi temp2,(1<<CLKCCE)
ldi temp3,(0x02<<CLKC0) ; CSEL = "0010"
sts CLKCSR,temp2 ; Enable CLKCSR register access
sts CLKCSR,temp3 ; Enable crystal oscillator clock
; Clock source switch
ldi temp3,(0x04<<CLKC0) ; CSEL = "0100"
sts CLKCSR,temp2 ; Enable CLKCSR register access
sts CLKCSR,temp3 ; Clock source switch
; Select watchdog clock (128KHz, fast rising power)
ldi temp3,((0x03<<CSEL0)|(0x02<<CSUT0))
sts CLKSELR, temp3 ; (*)
; (*) !!! Loose gain control of crystal oscillator !!!
; ==> WORKAROUND ...
sts CLKSELR, temp1
; ...
Affected Silicon Revisions
Rev. A Rev. B Rev. C
X X X
2.2.2 ā€œDisable Clock Sourceā€ Command Remains Enabled
In the dynamic clock switch module, the ā€˜disable clock sourceā€™ command remains running after disabling the targeted
clock source (the clock source is set in the CLKSELR register).
Work Around
After a ā€˜disable clock sourceā€™ command, reset the CLKCSR register by writing .0x80
ATtiny87/167 Automotive
Silicon Errata Issues
Ā© 2021 Microchip Technology Inc.
and its subsidiaries
Errata DS80000970A-page 3


Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: ATTINY87

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