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SH7708 数据表(PDF) 237 Page - Renesas Technology Corp

部件名 SH7708
功能描述  SuperH??RISC engine
PDF  633 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

SH7708 数据表(HTML) 237 Page - Renesas Technology Corp

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219
Bit 7—Compare Match Flag (CMF): Status flag that indicates that the values of RTCNT and
RTCOR match.
Bit 7: CMF
Description
0
The values of RTCNT and RTCOR do not match.
Clearing condition: When a refresh is performed after 0 has been written in
CMF and RFSH = 1 and RMODE = 0 (to perform a CBR refresh).
(Initial value)
1
The values of RTCNT and RTCOR match.
Setting condition: RTCNT = RTCOR*
Note: * Contents do not change when 1 is written to CMF.
Bit 6—Compare Match Interrupt Enable (CMIE): Enables or disables an interrupt request caused
when the CMF bit in RTCSR is set to 1. Do not set this bit to 1 when using CAS-before-RAS
refreshing or auto-refreshing.
Bit 6: CMIE
Description
0
Disables the interrupt request caused by CMF
(Initial value)
1
Enables the interrupt request caused by CMF
Bits 5 to 3—Clock Select Bits (CKS2–CKS0): These bits select the clock input to RTCNT. The
source clock is the external bus clock (CKIO). The RTCNT count clock is CKIO scaled by the
specified ratio.
Bit 5: CKS2
Bit 4: CKS1
Bit 3: CKS0
Description
0
0
0
Disables clock input
(Initial value)
1
Bus clock (CKIO)/4
1
0
CKIO/16
1
CKIO/64
1
0
0
CKIO/256
1
CKIO/1024
1
0
CKIO/2048
1
CKIO/4096



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