 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
UPD784938 Datasheet(PDF) 58 Page - NEC |
|
|
|||||||||||||||||||||||||||||
UPD784938 Datasheet(HTML) 58 Page - NEC |
|
|
58 / 733 page  CHAPTER 2 PIN FUNCTIONS 58 Preliminary User’s Manual U13987EJ1V0UM00 (ii) TxD (Transmit Data) /SO1 (Serial Output 1) TxD is the asynchronous serial interface serial data output pin. SO1 is the serial data output pin (in 3-wire serial I/O1 mode). (iii) SCK0 (Serial Clock 0) SCK0 is the clocked serial interface serial clock input/output pin (in 3-wire serial I/O 0 mode). (iv) SO0 (Serial Output 0) SO0 is the serial data output pin (in 3-wire serial I/O 0 mode). (v) TO0 to TO3 (Timer Output) The timer output pins. (5) P40 to P47 (Port 4) ... 3-state input/output Port 4 is an 8-bit input/output port with an output latch. Input/output can be specified in 1-bit units by setting the port 4 mode register (PM4). Each pin incorporates a software programmable pull-up resistor. This port has direct LED drive capability. Port 4 also functions as the time division address/data bus (AD0 to AD7) by the memory expansion mode register (MM) when external memory or I/Os are expanded. When RESET is input, port 4 is set as an input port (output high-impedance state), and the output latch contents are undefined. (6) P50 to P57 (Port 5) ... 3-state input/output Port 5 is an 8-bit input/output port with an output latch. Input/output can be specified in 1-bit units by setting the port 5 mode register (PM5). Each pin incorporates a software programmable pull-up resistor. This port has direct LED drive capability. In addition, P50 to P57 can be selected by means of the memory expansion mode register (MM) in 2-bit units as pins that function as the address bus (A8 to A15) when external memory or I/Os are expanded. When RESET is input, port 5 is set as an input port (output high-impedance state), and the output latch contents are undefined. (7) P60 to P67 (Port 6) ... 3-state input/output Port 6 is an 8-bit input/output port with an output latch. P60 to P67 incorporate a software programmable pull-up resistor. In addition to its function as a port, port 6 also has various alternate-function control signal pin functions, as shown in Table 2-4. Operations as control pins are performed by the respective function operations. When RESET is input, P60 to P67 are set as input port pins (output high-impedance state), and the output latch contents are undefined. Table 2-4. Port 6 Operation Modes Pin Name Port Mode Control Signal Input/Output Mode Operation to Operate as Control Pin P60 to P63 Input/output ports A16 to A19 output Specified in 2-bit units by bits MM3 to MM0 of the MM P64 RD output External memory expansion mode is specified by bits MM3 P65 WR output to MM0 of the MM P66 WAIT input Specified by setting bits PWn1 & PWn0 (n = 0 to 7) of the PWC1 & PWC2 and P66 to input mode HLDRQ input Bus hold enabled by the HLDE bit of the HLDM P67 HLDAK output REFRQ output Set (to 1) the RFEN bit of the RFM |
Similar Part No. - UPD784938 |
|
Similar Description - UPD784938 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
