NEC V850E/RS1 User Manual page 37

(10) Timer/counter
A two-channel 16-bit timer/event counter (TMQ), a four-channel 16-bit timer/event counter (TMP),
and a one-channel 16-bit interval timer (TMM), are provided on chip.
(11) Watchdog timer 2
A watchdog timer is provided on chip to detect inadvertent program loops, system abnormalities,
etc.
Either the Ring-OSC, the main clock can be selected as the source clock. Watchdog timer 2 gen-
erates a non-maskable interrupt request (INTWDT) or a reset signal after an overflow occurs.
(12) Serial interface
The V850E/RS1 includes four kinds of serial interfaces: asynchronous serial interface A (UARTA),
and 3-wire variable-length serial interface B (CSIB), 3 wire variable length serial interface 3 with
transmit and receive buffer (CSI3) and maximum two-channel CAN are provided as serial inter-
faces.
In the case of UARTA, data is transferred via the TXDAn pins and RXDAn pins (n = 0, 1).
In the case of CSIB, data is transferred via the SOBm pins, SIBm pins, and SCKBm pins
(m = 0, 1).
In the case of CSI3, data is transferred via the SO3m pins, SIm pins, and SCK3m pins (m = 0, 1).
A dedicated baud rate generator is provided on chip for CSIB, CSI3 and UARTA.
In the case of CAN, data is transferred via the CTXDn pins and CRXDn pins (n = 0, 1).
(13) A/D converter
This high-speed, high-resolution 10-bit A/D converter includes 16 analog input pins with auto-dis-
charge function and diagnostic mode. Conversion is performed using the successive approxima-
tion method.
(14) CRC function
A CRC operation circuit that generates 16-bit CRC (Cyclic Redundancy Check) code upon setting
of 8-bit data is provided on chip.
(15) On-chip debug function
An on-chip debug function via an N-wire-type in-circuit emulator that uses the JTAG (Joint Test
Action Group) communication specifications is provided. Switching between the normal port func-
tion and on-chip debugging function is done with the control pin input level and the on-chip debug
mode setting register (OCDM).
(16) Port
There are general-purpose port functions and control pin functions, as listed below.
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Chapter 1 Introduction
User's Manual U16702EE3V2UD00 37