HD64F2145 datasheet(274/829 Pages) RENESAS

274 / 829 page

Rev. 2.0, 08/02, page 234 of 788

MOV.W R0, @DACNT

; Write R0 contents to DACNT

Example 2: Read DADRA

MOV.W @DADRA, R0

; Copy contents of DADRA to R0

Table 10.2

Read and Write Access Methods for 16-Bit Registers

Read

Write

Word

Byte

Word

Byte

DADRA and DADRB

Yes

DACNT

Yes

Legend

Yes:

Permitted type of access. Word access includes successive byte accesses to the upper

byte (first) and lower byte (second).

×:

This type of access may give incorrect results.

10.5

Operation

A PWM waveform like the one shown in figure 10.2 is output from the PWMX pin. The value in

DADR corresponds to the total width (T

L) of the low (0) pulses output in one conversion cycle

(256 pulses when CFS = 0, 64 pulses when CFS = 1). When OS = 0, this waveform is directly

output. When OS = 1, the output waveform is inverted, and the DADR value corresponds to the

total width (T

H) of the high (1) output pulses. Figures 10.3 and 10.4 show the types of waveform

output available.

T: Resolution

TL =

tLn (OS = 0)

(When CFS = 0, m = 256

When CFS = 1, m = 64)

n = 1

1 conversion cycle

214 (= 16384))

Base cycle

64 or T

256)

Figure 10.2 PWM D/A Operation

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