データシートサーチシステム |
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HT82M9BE データシート(PDF) 15 Page - Holtek Semiconductor Inc |
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HT82M9BE データシート(HTML) 15 Page - Holtek Semiconductor Inc |
15 / 44 page HT82M9BE/HT82M9BA Rev. 1.80 15 December 22, 2008 operate until overflow occurs (a Timer/Event Counter 0/1 reloading will occur at the same time). When the Timer/Event Counter 0/1 (reading TMR0/TMR1) is read, the clock will be blocked to avoid errors. As clock blocking may results in a counting error, this must be taken into consideration by the programmer. Input/Output Ports There are 20 bidirectional input/output lines in the microcontroller, labeled from PA to PC, which are mapped to the data memory of [12H], [14H] and [16H] respectively. All of these I/O ports can be used for input and output operations. For input operation, these ports are non-latching, that is, the inputs must be ready at the T2 rising edge of instruction ²MOV A,[m]² (m=12H, 14H or 16H). For output operation, all the data is latched and remains unchanged until the output latch is rewritten. Each I/O line has its own control register (PAC, PBC and PCC) to control the input/output configuration. With this control register, CMOS/NMOS/PMOS output or Schmitt trigger input with or without pull-high/low resistor struc- tures can be reconfigured dynamically under software control. To function as an input, the corresponding latch of the control register must write a ²1². The input source V D D M U X P A , P B 4 , P B 7 W a k e - u p O p t i o n R e a d D a t a R e g i s t e r D Q C K S C o n t r o l B i t D a t a B u s W r i t e C o n t r o l R e g i s t e r C h i p R e s e t R e a d C o n t r o l R e g i s t e r W r i t e D a t a R e g i s t e r D a t a B i t P u l l - l o w P A , P B 4 , P B 7 W a k e - u p P A 6 / T M R 0 P u l l - h i g h P o r t O u t p u t C o n f i g u r a t i o n Q P A 0 ~ P A 5 , P A 6 / T M R 0 , P A 7 / T M R 1 P B 0 ~ P B 7 P C 0 ~ P C 3 D Q C K S Q P A 7 / T M R 1 Input/Output Ports T M 1 T M 0 T M R 0 T E T M 1 T M 0 T O N P u l s e W i d t h M e a s u r e m e n t M o d e C o n t r o l T i m e r / E v e n t C o u n t e r 0 P r e l o a d R e g i s t e r T i m e r / E v e n t C o u n t e r 0 D a t a B u s R e l o a d O v e r f l o w t o I n t e r r u p t f S Y S / 4 Timer/Event Counter 0 T M 1 T M 0 T M R 1 T E T M 1 T M 0 T O N P u l s e W i d t h M e a s u r e m e n t M o d e C o n t r o l 1 6 B i t s T i m e r / E v e n t C o u n t e r P r e l o a d R e g i s t e r D a t a B u s R e l o a d O v e r f l o w t o I n t e r r u p t f S Y S / 4 1 6 B i t s T i m e r / E v e n t C o u n t e r ( T M R 1 H / T M R 1 L ) L o w B y t e B u f f e r Timer/Event Counter 1 |
同様の部品番号 - HT82M9BE_08 |
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同様の説明 - HT82M9BE_08 |
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