239
3. Pin configuration
Table 9.19 shows the asynchronous event counter pin configuration.
Table 9.19
Pin Configuration
Name
Abbrev.
I/O
Function
Asynchronous event input H
AEVH
Input
Event input pin for input to event counter H
Asynchronous event input L
AEVL
Input
Event input pin for input to event counter L
4. Register configuration
Table 9.20 shows the register configuration of the asynchronous event counter.
Table 9.20
Asynchronous Event Counter Registers
Name
Abbrev.
R/W
Initial Value
Address
Event counter control/status register
ECCSR
R/W
H'00
H'FF95
Event counter H
ECH
R
H'00
H'FF96
Event counter L
ECL
R
H'00
H'FF97
Clock stop register 2
CKSTP2
R/W
H'FF
H'FFFB
9.7.2
Register Descriptions
1. Event counter control/status register (ECCSR)
OVH
CUEL
CRCH
CRCL
OVL
—
CH2
CUEH
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
R/W
*
R/W
R/W
R/W
R/W
*
R/W
R/W
R/W
Bit
Note:
*
Bits 7 and 6 can only be written with 0, for flag clearing.
Initial Value
Read/Write
ECCSR is an 8-bit read/write register that controls counter overflow detection, counter resetting,
and halting of the count-up function.
ECCSR is initialized to H'00 upon reset.