M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 109

• Manufacturer Part Number: M37702E6BFS
• Description: EPROM MCU/8BIT CMOS EMULATION CH
• Manufacturer: Renesas Electronics America

Specifications of M37702E6BFS

• Accessory Type: Emulator EPROM MCU
• For Use With/related Products: 7702
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

5.4 Event counter mode
In this mode, the timer counts an external signal. (Refer to Tables 5.4.1 and 5.4.2.) Figure 5.4.1 shows the
structures of the timer Ai mode register and timer Ai register in the event counter mode.
Table 5.4.1 Specifications of event counter mode (when not using two-phase pulse signal processing
Count source
Count operation
Divide ratio
Count start condition
Count stop condition
Interrupt request occurrence timing
TAi
TAi
Read from timer Ai register
Write to timer Ai register
IN
OUT
pin function
pin function
function)
Item
When count start bit is set to “1.”
When count start bit is cleared to “0.”
When the counter overflows or underflows.
Count source input
Programmable I/O port, pulse output, or up-count/down-count switch
signal input
Counter value can be read out.
External signal input to the TAi
The count source’s valid edge can be selected between the falling
and the rising edges by software.
Up-count or down-count can be switched by external signal or software.
When the counter overflows or underflows, reload register’s contents
are reloaded and counting continues.
While counting is stopped
When a value is written to timer Ai register, it is written to both
reload register and counter.
While counting is in progress
When a value is written to timer Ai register, it is written to only reload
register. (Transferred to counter at next reload time.)
For down-count
For up-count
7702/7703 Group User’s Manual
(FFFF
(n + 1)
16
1
1
– n + 1)
Specifications
IN
n: Timer Ai register setting value
pin
5.4 Event counter mode
TIMER A
5–19