Datasheet

R8C/18 Group, R8C/19 Group 1. Overview
Rev.1.40 Apr 14, 2006 Page 4 of 38
REJ03B0124-0140
1.3 Block Diagram
Figure 1.1 shows a Block Diagram.
Figure 1.1 Block Diagram
R8C/Tiny Series CPU core
8
4
1 3
Timers
Timer X (8 bits)
Timer Z (8 bits)
Timer C (16 bits)
Comparator
(1 bit
× 4 channels)
System clock generator
XIN-XOUT
High-speed on-chip
oscillator
Low-speed on-chip
oscillator
UART or
clock synchronous serial I/O
(8 bits
× 1 channel)
Memory
Watchdog timer
(15 bits)
ROM
(1)
RAM
(2)
Multiplier
R0H R0L
R1H
R2
R3
R1L
A0
A1
FB
SB
USP
ISP
INTB
PC
FLG
I/O ports Port P1
Port P3 Port P4
NOTES:
1. ROM size varies with MCU type.
2. RAM size varies with MCU type.
UART
(8 bits
× 1 channel)
Peripheral Functions