參數(shù)資料
型號: AT90S2313-10PC
廠商: Atmel
文件頁數(shù): 29/92頁
文件大小: 0K
描述: IC MCU 2K FLSH 10MHZ UART 20DIP
標(biāo)準(zhǔn)包裝: 18
系列: AVR® 90S
核心處理器: AVR
芯體尺寸: 8-位
速度: 10MHz
連通性: SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 15
程序存儲器容量: 2KB(1K x 16)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 128 x 8
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 4 V ~ 6 V
振蕩器型: 外部
工作溫度: 0°C ~ 70°C
封裝/外殼: 20-DIP(0.300",7.62mm)
包裝: 管件
35
AT90S2313
0839I–AVR–06/02
The TEMP Register is also used when accessing TCNT1 and OCR1A. If the main pro-
gram and interrupt routines perform access to registers using TEMP, interrupts must be
disabled during access from the main program or interrupts if interrupts are re-enabled.
Timer/Counter1 in PWM Mode
When the PWM mode is selected, Timer/Counter1 and the Output Compare Register1
(OCR1A) form an 8-, 9-, or 10-bit, free-running, glitch-free and phase-correct PWM with
output on the PB3(OC1) pin. Timer/Counter1 acts as an up/down counter, counting up
from $0000 to TOP (see Table 11), where it turns and counts down again to zero before
the cycle is repeated. When the counter value matches the contents of the 8, 9 or 10
least significant bits of OCR1A, the PB3(OC1) pin is set or cleared according to the set-
tings of the COM1A1 and COM1A0 bits in the Timer/Counter1 Control Register
(TCCR1). Refer to Table 12 for details.
Note:
1. The initial state of the OC1 output line is undefined.
Note that in the PWM mode, the 10 least significant OCR1A bits, when written, are
transferred to a temporary location. They are latched when Timer/Counter1 reaches
TOP. This prevents the occurrence of odd-length PWM pulses (glitches) in the event of
an unsynchronized OCR1A write. See Figure 32 for an example.
Figure 32. Effects on Unsynchronized OCR1 Latching
Table 11. Timer TOP Values and PWM Frequency
PWM Resolution
Timer TOP Value
Frequency
8-bit
$00FF (255)
fTC1/510
9-bit
$01FF (511)
fTC1/1022
10-bit
$03FF(1023)
fTC1/2046
Table 12. Compare1 Mode Select in PWM Mode(1)
COM1A1
COM1A0
Effect on OC1
0
Not connected
0
1
Not connected
10
Cleared on compare match, upcounting. Set on compare match,
down-counting (non-inverted PWM).
11
Cleared on compare match, downcounting. Set on compare match,
up-counting (inverted PWM).
Compare Value changes
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