M37274EFSP datasheet(28/147 Pages) MITSUBISHI

Part #	M37274EFSP

Description	SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER??????

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Manufacturer	MITSUBISHI [Mitsubishi Electric Semiconductor]

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

and ON-SCREEN DISPLAY CONTROLLER

M37274EFSP

PRELIMINARY

Notice:

This

is not

a final

specification.

Some

paramentic

limits

are

subject

to change.

MITSUBISHI MICROCOMPUTERS

(4) Operating of 14-bit PWM

As with 8-bit PWM, set the bit 0 of the PWM mode register 1 (ad-

dress 020A16) to “0” (at reset, bit 0 is already set to “0” automati-

cally), so that the PWM count source is supplied. Pin DA is also used

as port P03. Select output mode by setting bit 3 of the port P0 direc-

tion register. Next, select the output polarity by bit 3 of the PWM

mode register 1. Then, the 14-bit PWM outputs from the D-A output

pin by setting bit 1 of the PWM mode register 1 to “0” (at reset, this bit

already set to “0” automatically) to select the DA output.

The output example of the 14-bit PWM is shown in Figure 23.

The 14-bit PWM divides the data of the DA latch into the low-order 6

bits and the high-order 8 bits.

The fundamental waveform is determined with the high-order 8-bit

data “DH.” A “H” level area with a length

τ ! DH(“H” level area of

fundamental waveform) is output every short area of “t” = 256

τ =

64

ms (τ is the minimum resolution bit width of 0.25 µs). The “H” level

area increase interval (tm) is determined with the low-order 6-bit data

“DL.” The “H” level are of smaller intervals “tm” shown in Table 6 is

longer by

τ than that of other smaller intervals in PWM repeat period

“T” = 64t. Thus, a rectangular waveform with the different “H” width is

output from the D-A pin. Accordingly, the PWM output changes by

τ

unit pulse width by changing the contents of the DA-H and DA-L

registers. A length of entirely “H” output cannot be output, i. e. 256/

256.

(5) Output after Reset

At reset, the output of ports P00–P02 and P04–P07 is in the high-

impedance state and the contents of the PWM register and the PWM

circuit are undefined. Note that after reset, the PWM output is unde-

fined until setting the PWM register.

PWM OUTPUT FUNCTION

The M37274EFSP is equipped with a 14-bit PWM (DA) seven 8-bit

PWMs (PWM0–PWM6). DA has a 14-bit resolution with the mini-

mum resolution bit width of 0.25

µs and a repeat period of

4096

ms (for f(XIN) = 8 MHz). PWM0–PWM6 have the same circuit

structure and an 8-bit resolution with minimum resolution bit width of

4

µs and repeat period of 1024 µs (for f(XIN) = 8 MHz) .

Figure 22 shows the PWM block diagram. The PWM timing generat-

ing circuit applies individual control signals to PWM0–PWM6 using

f(XIN) divided by 2 as a reference signal.

(1) Data Setting

When outputting DA, first set the high-order 8 bits to the DA-H regis-

ter (address 024016), then the low-order 6 bits to the DA-L register

(address 024116). When outputting PWM0–PWM6, set 8-bit output

data to the PWMi register (i means 0 to 6; addresses 020016 to

020616).

(2) Transmitting Data from Register to PWM circuit

Data transfer from the 8-bit PWM register to the 8-bit PWM circuit is

executed at writing data to the register.

The signal output from the 8-bit PWM output pin corresponds to the

contents of this register.

Also, data transfer from the DA register (addresses 024016 and

024116) to the 14-bit PWM circuit is executed at writing data to the

DA-L register (address 024116). Reading from the DA-H register (ad-

dress 024016) means reading this transferred data. Accordingly, it is

possible to confirm the data being output from the D-A output pin by

reading the DA register.

(3) Operating of 8-bit PWM

The following explains PWM operation.

First, set the bit 0 of PWM mode register 1 (address 020A16) to “0”

(at reset, bit 0 is already set to “0” automatically), so that the PWM

count source is supplied.

PWM0–PWM3 are also used as pins P04–P07, PWM4–PWM6 are

also used as pins P00–P02, respectively. Set the corresponding bits

of the port P0 direction register to “1” (output mode). And select each

output polarity by bit 3 of PWM mode register 1 (address 020A16).

Then, set bits 7 to 0 of PWM mode register 2 to “1” (PWM output).

The PWM waveform is output from the PWM output pins by setting

these registers.

Figure 23 shows the 8-bit PWM timing. One cycle (T) is composed

of 256 (28) segments. The 8 kinds of pulses, relative to the weight of

each bit (bits 0 to 7), are output inside the circuit during 1 cycle.

Refer to Figure 20 (a). The 8-bit PWM outputs waveform which is

the logical sum (OR) of pulses corresponding to the contents of bits

0 to 7 of the 8-bit PWM register. Several examples are shown in

Figure 23 (b). 256 kinds of output (HIGH area: 0/256 to 255/256) are

selected by changing the contents of the PWM register. A length of

entirely HIGH cannot be output, i.e. 256/256.

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