M37271MF datasheet(21/98 Pages) RENESAS

21 / 98 page

MITSUBISHI MICROCOMPUTERS

M37271MF-XXXSP

M37271EF-XXXSP, M37271EFSP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

SERIAL I/O

The M37271MF-XXXSP has a built-in serial I/O which can either trans-

mit or receive 8-bit data in serial in the clock synchronous mode.

The serial I/O block diagram is shown in Figure 12. The synchroniz-

ing clock I/O pin (SCLK), and data output pin (SOUT) also function as

port P4, data input pin (SIN) also functions as port P1.

Bit 2 of the serial I/O mode register (address 021316) selects whether

the synchronizing clock is supplied internally or externally (from the

P46/SCLK pin). When an internal clock is selected, bits 1 and 0 select

whether f(XIN) is divided by 8, 16, 32, or 64. To use P45/SOUT and

P46/SCLK pins for serial I/O, set the corresponding bits of the port P4

direction register (address 00C916) to “0.” To use P17/SIN pin for

serial I/O, set the corresponding bit of the port P1 direction register

(address 00C316) to “0.”

Fig. 12. Serial I/O block diagram

The operation of the serial I/O function is described below. The func-

tion of the serial I/O differs depending on the clock source; external

clock or internal clock.

Serial I/O shift register (8)

Data bus

Serial I/O

interrupt request

Selection gate: Connect to

black colored

side at reset.

Synchronization

circuit

Frequency divider

1/8

1/4

1/16

SM1

SM0

Serial I/O counter (8)

SM5 : LSB

MSB

SM2

1/2

XIN

P17/SIN

P45/SOUT

P46/SCLK

1/2

(Address 021416)

XCIN

1/2

CM7

1/2

Note : When the data is set in the serial I/O register (address 0214 16), the register functions as the serial I/O shift register.

(Note)

CM : CPU mode register

SM : Serial I/O mode register

M37271MF Datasheet(PDF) 21 Page - Renesas Technology Corp

M37271MF Datasheet(HTML) 21 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98

Datasheet Download

Link URL