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參數資料
型號: W741C260
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 4-BIT Microcontroller(多次可編程4位的微控制器)
中文描述: 4-BIT, MROM, 4.19 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數: 22/92頁
文件大小: 488K
代理商: W741C260
W741C260
- 22 -
Input/Output Ports RA, RB
Port RA consists of pins RA.0 to RA.3 and port RB consists of pins RB.0 to RB.3. At initial reset,
input/output ports RA and RB are both in input mode. When RA and RB are used as output ports,
CMOS or NMOS open drain output type can be selected by the PM0 register. Each pin of port RA or
RB can be specified as input or output mode independently by the PM1 and PM2 registers. The
MOVA R, RA or MOVA R, RB instructions operate the input functions and the MOV RA, R or MOV
RB, R operate the output functions. For more details, refer to the instruction table and Figure 9.
I/O PIN
RA.n(RB.n)
DATA
BUS
Buffer
Output
PM0.0 (or PM0.1)
PM1.n
(or PM2.n)
MOVA R, RA
(or MOVA R, RB)
instruction
MOV RA, R
(or MOV RB, R)
Instruction
Enable
Enable
V
Input/Output Pin of the RA(RB)
DD
Figure 9. Architecture of Input/Output Pins
Input Ports RC, RD
Port RC consists of pins RC.0 to RC.3, and port RD consists of pins RD.0 to RD.3. Each pin of port
RC and port RD can be connected to a pull-up resistor, which is controlled by the port mode 0 register
(PM0). When the PEF, HEF, and IEF corresponding to the RC port are set, a signal change at the
specified pins of port RC will execute the hold mode release or interrupt subroutine. Port status
register 0 (PSR0) record the signal changing status on the port RC. PSR0 can be read out and
cleared by the MOVA R, PSR0, and CLR PSR0 instructions.
Refer to Figure 10 and the instruction
table for more details. The RD port is used as input port only, it has no hold mode release or interrupt
functions.
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