GMS81C1404 Datasheet, PDF (30/93 Pages) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS81C1404/GMS81C1408
1. “byte, bit” means that register can be addressed by not only bit
but byte manipulation instruction.
2. “byte” means that register can be addressed by only byte
manipulation instruction. On the other hand, do not use any
read-modify-write instruction such as bit manipulation for
clearing bit.
Note: Several names are given at same address. Refer to
below table.
Addr.
D1H
D3H
D4H
D7H
D9H
DAH
ECH
When read
Timer Capture PWM
Mode Mode Mode
T0 CDR0
-
-
T1 CDR1 T1PDR
T2 CDR2
-
-
T3 CDR3 T3PDR
BITR
When write
Timer
Mode
PWM
Mode
TDR0
-
TDR1 T1PPR
-
T1PDR
TDR2
-
TDR3 T3PPR
-
T3PDR
CKCTLR
Table 9-2 Various Register Name in Same Address
Stack Area
The stack provides the area where the return address is
saved before a jump is performed during the processing
routine at the execution of a subroutine call instruction or
the acceptance of an interrupt.
When returning from the processing routine, executing the
subroutine return instruction [RET] restores the contents of
the program counter from the stack; executing the interrupt
return instruction [RETI] restores the contents of the pro-
gram counter and flags.
The save/restore locations in the stack are determined by
the stack pointed (SP). The SP is automatically decreased
after the saving, and increased before the restoring. This
means the value of the SP indicates the stack location
number for the next save.
28
June. 2001 Ver 1.2