SH7021 datasheet(127/509 Pages) RENESAS

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RENESAS 109

Bit:

Bit name:

—

Initial value:

R/W:

—

Bit:

Bit name:

CMF

CMIE

CKS2

CKS1

CKS0

—

Initial value:

R/W:

R/W

—

•

Bits 15–8 (reserved): These bits always read as 0.

•

Bit 7 (compare match flag (CMF)): CMF is a flag that indicates whether the values of RTCNT

and the refresh time constant register (RTCOR) match. When 0, the value of RTCNT and

RTCOR do not match; when 1, the value of RTCNT and RTCOR match.

Bit 7: CMF

Description

RTCNT does not equal the value of RTCOR (initial value)

To clear CMF, the CPU must read CMF after it has been set to 1, then write a

0 in this bit

Value RTCNT is equal to the value of RTCOR

•

Bit 6 (compare match interrupt enable (CMIE)): CMIE enables or disables the compare match

interrupt (CMI) generated when CMF is set to 1 in RTCSR (RTCNT value = RTCOR value).

When cleared to 0, CMI interrupt is disabled; when set to 1, it is enabled.

Bit 6: CMIE

Description

Compare match interrupt request (CMI) is disabled (initial value)

Compare match interrupt request (CMI) is enabled

•

Bits 5–3 (clock select bits 2–0 (CKS2–CKS0)): CKS2–CKS0 select the clock input to RTCNT

from among the seven types of clocks created by dividing the system clock (

φ). When the input

clock is selected with the CKS2–CKS0 bits, RTCNT starts to increment.

SH7021 Datasheet(PDF) 127 Page - Renesas Technology Corp

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