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| 型號(hào)： | M37225M6 |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Single Chip 8 Bits Microcomputer(8位單片機(jī)) |
| 中文描述： | 單芯片8位單片機(jī)（8位單片機(jī)） |
| 文件頁(yè)數(shù)： | 27/133頁(yè) |
| 文件大?。?/td> | 1610K |
| 代理商： | M37225M6 |
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27
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
M37225M6–XXXSP, M37225M8–XXXSP
M37225ECSP
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
8.5 SERIAL I/O
This microcomputer has a built-in serial I/O which can either transmit
or receive 8-bit data serially in the clock synchronous mode.
The serial I/O block diagram is shown in Figure 8.5.1. The synchro-
nous clock I/O pin (S
CLK
), and data output pin (S
OUT
) also function
as port P4, data input pin (S
IN
) also functions as port P2.
Bit 3 of the serial I/O mode register (address 00DC
16
) selects whether
the synchronous clock is supplied internally or externally (from the
S
CLK
pin). When an internal clock is selected, bits 1 and 0 select
whether f(X
IN
) or f(X
CIN
) is divided by 4, 16, 32, or 64. To use S
IN
pin
for serial I/O, set the corresponding bit of the port P2 direction regis-
ter (address 00C5
16
) to “0.”
Fig. 8.5.1 Serial I/O Block Diagram
The operation of the serial I/O is described below. The operation of
the serial I/O differs depending on the clock source; external clock or
internal clock.
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