3069RF-ZTAT Datasheet, PDF (154/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

Note: * Only 0 can be written to clear the flag.
Bit 7—Compare Match Flag (CMF): Status flag that indicates a match between the values of
RTCNT and RTCOR.
Bit 7
CMF
0
1
Description
[Clearing conditions]
When the chip is reset and in standby mode
Read CMF when CMF = 1, then write 0 in CMF
[Setting condition]
When RTCNT = RTCOR
(Initial value)
Bit 6—Compare Match Interrupt Enable (CMIE): Enables or disables the CMI interrupt
requested when the CMF flag is set to 1 in RTMCSR. The CMIE bit is always cleared to 0 when
any of areas 2 to 5 is designated as DRAM space.
Bit 6
CMIE
0
1
Description
The CMI interrupt requested by CMF is disabled
The CMI interrupt requested by CMF is enabled
(Initial value)
Bits 5 to 3—Refresh Counter Clock Select (CKS2 to CKS0): These bits select the clock to be
input to RTCNT from among 7 clocks obtained by dividing the system clock (φ). When the input
clock is selected with bits CKS2 to CKS0, RTCNT begins counting up.
Bit 5 Bit 4 Bit 3
CKS2 CKS1 CKS0 Description
0
0
0
Count operation halted
1
φ/2 used as counter clock
1
0
φ/8 used as counter clock
1
φ/32 used as counter clock
1
0
0
φ/128 used as counter clock
1
φ/512 used as counter clock
1
0
φ/2048 used as counter clock
1
φ/4096 used as counter clock
(Initial value)
Bits 2 to 0—Reserved: These bits cannot be modified and are always read as 1.
Rev. 5.0, 09/04, page 132 of 978