Rev.6.00 Oct.28.2004 page 119
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REJ09B0138-0600H
Bit 3—Compare Match Interrupt Enable (CMIE): Enables or disables interrupt requests (CMI) by the CMF flag when
the CMF flag in DRAMCR is set to 1.
When refresh control is performed (RFSHE = 1), the CMIE bit is always cleared to 0.
Bit 3
CMIE
Description
0
Interrupt request (CMI) by CMF flag disabled
(Initial value)
1
Interrupt request (CMI) by CMF flag enabled
Bits 2 to 0—Refresh Counter Clock Select (CKS2 to CKS0): These bits select the clock to be input to RTCNT from
among 7 internal clocks obtained by dividing the system clock (ø). When the input clock is selected with bits CKS2 to
CKS0, RTCNT begins counting up.
Bit 2
CKS2
Bit 1
CKS1
Bit 0
CKS0
Description
0
0
0
Count operation disabled
(Initial value)
1
Count uses ø/2
1
0
Count uses ø/8
1
Count uses ø/32
1
0
0
Count uses ø/128
1
Count uses ø/512
1
0
Count uses ø/2048
1
Count uses ø/4096
6.2.8
Refresh Timer/Counter (RTCNT)
Bit
:
7
6
5
4
3
2
1
0
Initial value :
0
0
0
0
0
0
0
0
R/W
:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RTCNT is an 8-bit readable/writable up-counter.
RTCNT counts up using the internal clock selected by bits CKS2 to CKS0 in DRAMCR.
When RTCNT matches RTCOR (compare match), the CMF flag in DRAMCR is set to 1 and RTCNT is cleared to H'00.
If the RFSHE bit in DRAMCR is set to 1 at this time, a refresh cycle is started. Also, if the CMIE bit in DRAMCR is set
to 1, a compare match interrupt (CMI) is generated.
RTCNT is initialized to H'00 by a power-on reset and in hardware standby mode. It is not initialized by a manual reset* or
in software standby mode.
Note:
* Manual reset is only supported in the H8S/2357 ZTAT.
Содержание ZTAT H8S/2357F
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Страница 1047: ...H8S 2357 Group H8S 2357F ZTATTM H8S 2398F ZTATTM Hardware Manual 2 6 2 Ote machi Chiyoda ku Tokyo 100 0004 Japan...