Os motores de busca de Datasheet de Componentes eletrônicos |
|
HT82K94E Folha de dados(PDF) 18 Page - Holtek Semiconductor Inc |
|
HT82K94E Folha de dados(HTML) 18 Page - Holtek Semiconductor Inc |
18 / 43 page HT82K94E/HT82K94A Rev. 2.40 18 November 5, 2014 optioned as CMOS/NMOS/PMOS configurations. These control registers are mapped to locations 13H, 15H, 17H and 19H. After a chip reset, these input/output lines remain at high levels or floating state (depending on the pull-high op- tions). Each bit of these input/output latches can be set or cleared by ²SET [m].i² and ²CLR [m].i² (m=12H, 14H, 16H or 18H) instructions. Some instructions first input data and then follow the output operations. For example, ²SET [m].i², ²CLR [m].i ², ²CPL [m]², ²CPLA [m]² read the entire port states into the CPU, execute the defined operations (bit-operation), and then write the results back to the latches or the accumulator. Each line of all the I/O ports have the capability of wak- ing up the device. There are pull-high options available for I/O lines. Once the pull-high option of an I/O line is selected, the I/O line have pull-high resistor. Otherwise, the pull-high resistor is absent. It should be noted that a non-pull-high I/O line operating in input mode will cause a floating state. It is recommended that unused or not bonded out I/O lines should be set as output pins by software instruction to avoid consuming power under input floating state. Low Voltage Reset/Detector - LVR/LVD The microcontroller contains a low voltage reset circuit in order to monitor the supply voltage of the device. If the supply voltage of the device drops to within a range of 0.9V~VLVR such as might occur when changing the bat- tery, the LVR will automatically reset the device inter- nally. The LVR includes the following specifications: · For a valid LVR signal, a low voltage i.e. a voltage in the range between 0.9V~VLVR must exist for greater than 1ms. If the low voltage state does not exceed 1ms, the LVR will ignore it and do not perform a reset function. · The LVR uses the ²OR² function with the external RES signal to perform chip reset. The relationship between VDD and VLVR is shown below. Note: VOPR is the voltage range for proper chip opera- tion at 4MHz system clock. There is a low voltage detector (LVD) and a low voltage reset circuit (LVR) implemented in the microcontrollers. Where LVR function can be enabled/disabled by op- tions. User can read the LVD detector status (0/1) from MISC.5. The LVR has the same effect or function with the external RES signal which performs a chip reset. Both LVR and LVD functions will disable in the HALT mode. There are two kind of LVR/LVD definition: 2-battery or 3-battery option. When 2-battery option is selected: LVR=2.2V; LVD=2.4V. Otherwise, 3-battery option is selected: LVR=2.4V; LVD=2.6V. 5 . 5 V 2 . 2 V ~ 2 . 4 V 2 . 0 V ~ 2 . 2 V 0 . 9 V V D D V O P R V L V R 5 . 5 V V D D 5 . 5 V V L V R 0 . 9 V 0 V R e s e t S i g n a l R e s e t * 1 * 2 N o r m a l O p e r a t i o n R e s e t L V R D e t e c t V o l t a g e Low Voltage Reset Note: *1. To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system clock pulses before entering the normal operation. *2. Since low voltage has to be maintained for over 1ms in its original state, therefore there ¢s a 1ms delay before entering the reset mode |
Nº de peça semelhante - HT82K94E_14 |
|
Descrição semelhante - HT82K94E_14 |
|
|
Ligação URL |
Privacy Policy |
ALLDATASHEETPT.COM |
ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |