H8SSLASH2218 datasheet(410/750 Pages) RENESAS

410 / 750 page

Section 11 Realtime Clock (RTC)

Rev.6.00 Jun. 03, 2008 Page 362 of 698

REJ09B0074-0600

Table 11.3

Operating State in Each Mode

Function

High-

Speed

Medium-

Speed

Sleep

Module

Stop

Watch

Subactive

Subsleep

Software

Standby

Hard-ware

Standby

Clock operation

Subclock

operation

Subclock

operation

Subclock

operation

Halted

(Retained)

Subclock

operation

Subclock

operation

Subclock

operation

Subclock

operation

Halted

(Reset)

Free running

timer operation

Operating

Halted

(Retained)

Halted

(Retained)

Halted

(Retained)

Halted

(Retained)

Halted

(Retained)

Halted

(Reset)

11.7

Usage Notes

(1) Notes on Using the Emulator

In the E6000 emulator the RTC module is mounted on an external extended board. Since it must

be accessed as an external module, the limitations listed below apply. These limitations do not

apply to the E10A or to product chips.

• RTC operation is not supported in the H8S/2218 Group's mode 7 (single-chip mode).

• When using the RTC module in the H8S/2218 Group's mode 6 (on-chip ROM-enabled mode)

or the H8S/2212 Group's mode 7 (single-chip mode), A7 to A0 are input pins in the initial

status. Therefore, A7 to A0 must be set as output pins by setting PC7DDR to PC0DDR to H'FF

before accessing the RTC module.

• The above setting is not necessary when using the RTC module in the H8S/2218 Group's

modes 4 and 5 (on-chip ROM-disabled mode) because A7 to A0 are output pins.

(2) Bus Interface

The bus interface of the module conforms to the bus specifications for external area 7.

Consequently, before accessing the RTC module, area 7 must be specified as having an 8-bit bus

width and 3-state access using the bus controller register.

(3) Method for Reading Pin States Using the Port D Register (PORTD)

First access EXMDLSTP or the RTC register (address range: H'FFFF40 to H'FFFF5F). Then, you

must perform a dummy read to the external address space (such as H'FFEF00 to H'FF7FF) outside

the range H'FFFF40 to H'FFFF5F before reading PORTD.

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