Format Of Prescaler Mode Register 1 (Prm1); Format Of Capture/Compare Control Register 1 (Crc1) - NEC PD78212 User Manual

µ PD78214 Sub-Series
7
PRM1 PRS23
Remark f : System clock frequency
CLK
(3) Capture/compare control register 1 (CRC1)
The CRC1 register is used to specify the operation of the CR11 capture/compare register and the condition for
enabling the clear operation of 8-bit timer 1 (TM1).
The CRC1 register allows only write operation using an 8-bit manipulation instruction. Fig. 7-46 shows the
format of the CRC1 register.
When the RESET signal is applied, the CRC1 register is cleared to 00H.
7
CRC1 0
144
Fig. 7-45 Format of Prescaler Mode Register 1 (PRM1)
6 5 4 3
PRS22 PRS21 PRS20 0
PRS12
Fig. 7-46 Format of Capture/Compare Control Register 1 (CRC1)
6 5 4 3
0 0 0 CLR11
2 1 0
PRS12 PRS11 PRS10
PRS11 PRS10
Specification of count clock [Hz]
0 0 0
0 0 1
f /16
CLK
0 1 0
f /32
0 1 1
CLK
1 0 0 f /64
CLK
f /128
1 0 1
CLK
f /256
1 1 0
CLK
1 1 1 f /512
CLK
These bits specify the count clock supplied to
8-bit timer/counter 2 (TM2) (see Fig. 7-68).
2 1 0
CM CLR10 0
CLR10
Clearing TM1 when TM1 coincides with CR10
0 Disabled
1
Enabled
Operation speci-
CLR11 CM
fication of the
CR11 register
0 0
Compare
register
1
0
0 1
Capture
register
1 1
f = 6 MHz
CLK
Resolution
µ
2.6 s
µ
5.3 s
µ
10.7 s
µ
21.3 s
µ
42.7 s
µ
85.3 s
Clearing TM1
Disabled
Enabled (when contents
of TM1 register coincides
with those of CR11 register)
Disabled
Enabled (when contents
of TM1 register is captured
to the CR11 register)