Section 4 Resets; Types Of Resets - Renesas H8S/2100 Series Hardware Manual

4.1

Types of Resets

There are three types of resets: a pin reset, power-on reset, and watchdog timer reset. Table 4.1
shows the reset names and sources.
The internal state and pins are initialized by a reset. Figure 4.1 shows the reset targets to be
initialized.
Table 4.1 Reset Names And Sources
Reset Name
Pin reset
Power-on reset
Watchdog timer reset
RES
VCC
Power-on reset
generation circuit
Watchdog timer

Section 4 Resets

Source
Voltage input to the RES pin is driven low.
Rise or fall in VCC
The watchdog timer overflows.
Pin reset
Power-on reset
Watchdog
timer reset
Figure 4.1 Block Diagram of Reset Circuit
Section 4 Resets
Registers in the power-on reset
generation circuit are initialized
(RSTSR. PORF)
SYSCR.XRST is initialized
Internal states other than above,
and pin states are initialized
Rev. 1.00 May 09, 2008 Page 75 of 954
REJ09B0462-0100